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944-LT1 LS3 Conversion

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Re: 944-LT1 LS3 Conversion

Post  944-LT1 on Tue Aug 04, 2009 7:55 am

For people wondering about the oil pan...It is not going to be sold. My uncle wants to keep it for his car. Sorry for the trouble.

Right now, the BH is still up for grabs (includes bearing retainer, TO bearing, fork and slave cylinder...comes as bolt on assembly.) as well as the crossmember/motor mounts.

Besides that, Heres my current list needed for the LS conversion. Wondered if you guys could take a look and see whats needed beyond this and if these parts are correct or if you have any of these I can buy? Really need a bellhousing....cant find one. The part in question the most is the TO bearing.

Bellhousing adapter plate: XSchop, thanks.
Bellhousing: GM 12554980
Throwout bearing assy. : GM 89059282
Flywheel: GM 12571611
Pressure Plate: GM 24248985
Clutch disc: Centerforce# CTF-383946
Pilot bearing adapter: XSchop, thanks.
Oil pan: Moroso 20140
Thermostat housing: 170-911LS1C $39.99 Jegs
Harness modification: GREG!!!!!!!!!!
Harmonic balancer: GM 12620556
Headers: Summit weld-up kit
Billet drop down spacers: Making these myself as of now.
Remote oil filter and hoses: Summit universal kit?
Regulator/filter: NAPA# FIL3737 or GM 10299146 or Wix 33737 or AC Delco GF822 $30.00

Anything you guys see that needs to be added or found cheap and easy?


Last edited by 944-LT1 on Mon Aug 10, 2009 6:04 pm; edited 1 time in total

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Re: 944-LT1 LS3 Conversion

Post  gt1scca on Tue Aug 04, 2009 11:21 am

944-LT1 wrote:Really need a bellhousing....cant find one. The part in question the most is the TO bearing.

Bellhousing adapter plate: XSchop, thanks.
Bellhousing: GM 12554980
Throwout bearing assy. : GM 89059282
Flywheel: GM 12571611
Pressure Plate: GM 24248985
Clutch disc: Centerforce# CTF-383946
Pilot bearing adapter: XSchop, thanks.
Oil pan: Moroso 20140
Thermostat housing: 170-911LS1C $39.99 Jegs
Harness modification: ???
Harmonic balancer: GM 12620556
Headers: Summit weld-up kit
Billet drop down spacers: Making these myself as of now.
Remote oil filter and hoses: Summit universal kit?
Regulator/filter: NAPA# FIL3737 or GM 10299146 or Wix 33737 or AC Delco GF822 $30.00

Anything you guys see that needs to be added or found cheap and easy?

bellhousing...Ask modenas (he has found a few...xschop may also have a "spare"

TO bearing... #13207 / BENDIX / ADVANCE AUTO PARTS / $71.48
(trimmed for the relief in the BH plate)

Harness modification:...Duh, [ME], should be cake, and will run on an LS1 / LS2 PCM
(MAP plug has to be replaced, and use the LS7 map sensor-I've researched this part, dude)
BUT, the LS3 came with a PCM and harness, didn't it?

Razz
.


Last edited by gt1scca on Tue Aug 04, 2009 12:04 pm; edited 1 time in total (Reason for editing : Harness misc.)

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Re: 944-LT1 LS3 Conversion

Post  944-LT1 on Tue Aug 04, 2009 5:43 pm

gt1scca wrote:

bellhousing...Ask modenas (he has found a few...xschop may also have a "spare"

TO bearing... #13207 / BENDIX / ADVANCE AUTO PARTS / $71.48
(trimmed for the relief in the BH plate)

Harness modification:...Duh, [ME], should be cake, and will run on an LS1 / LS2 PCM
(MAP plug has to be replaced, and use the LS7 map sensor-I've researched this part, dude)
BUT, the LS3 came with a PCM and harness, didn't it?

Razz
.

Oh yeah the LS3 came with the full harness, ECU and pedal. So yeah.....coming your way. Laughing

Thanks!

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Re: 944-LT1 LS3 Conversion

Post  944-LT1 on Mon Aug 10, 2009 4:22 pm

ALRIGHT. . . . Something very weird happened today. I got my BH adapter and pilot bearing adapter in from XS today and installed it on the TT. Then I went to my old box (the one that all the RH stuff originally came in from years ago) to put the old bellhousing in the box. Well... in the bottom of the box is this sealed bearing. Dont remember EVER seeing it down there but I grabbed it and it says "6202 RSR" on the sealed plastic part and then "FAG" on the inner race. I tried it on the TT tip for shits and it fits really nicely over it and so I thought 'what are the chances' and tried it in the pilot bearing adapter and it fits that as well!!!????!!!!

What the hell is going on here! I mean, Im all for dumb luck but it leads me to believe that RH had these bearings way way way back when they didnt even offer an LS kit and told people the LS conversion wouldnt even be possible! I know I never bought this bearing.

BUT, is this even the right bearing. If not, then nevermind. Laughing

I googled it and its specs according to the "6202 RSR" stamping is:
FAG 6202 RSR, Single Row Radial Bearing, 15 mm ID x 35 mm OD x 11 mm Wide, Double Sealed (Contact), Standard Precision (ABEC 1), Steel Cage, Normal Clearance (C0) (F30)

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Re: 944-LT1 LS3 Conversion

Post  xschop on Mon Aug 10, 2009 6:23 pm

BTW, what is your TT shaft tip to TT flange/BH mating face measurement?

I also found the dims of the alloy spacers you asked about and drew these up. I use 1" billet steel to start with and then trim out enough across the plane to leave 1/4" bridge and lighten them up....super strong....
CROSSMEMBER....
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REAR CONTROL ARMS
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Re: 944-LT1 LS3 Conversion

Post  modenas on Mon Aug 10, 2009 7:16 pm

your need for a clutch disc is important? well ebay has one by weber and they sale for 28 total and that includes shipping. only problem with this is that it is a mopar disc and it a 10.5, we all know mopar is selling out so get it while you can.
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Re: 944-LT1 LS3 Conversion

Post  944-LT1 on Mon Aug 10, 2009 9:03 pm

Sweet that will really help out.

BTW, My cars TT is already chamfered stock which is why I think the adapter slid in so nicely and snug. Im not sure if all TT's are like that though. The length of the TT tip from TT face to tip is exactly 5.820" as I checked it with 2 different calipers.

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Re: 944-LT1 LS3 Conversion

Post  944-LT1 on Mon Aug 10, 2009 9:07 pm

modenas wrote:your need for a clutch disc is important? well ebay has one by weber and they sale for 28 total and that includes shipping. only problem with this is that it is a mopar disc and it a 10.5, we all know mopar is selling out so get it while you can.

No! I didnt know Mopar was done. Shocked The flywheel for the LS2/3 is 12" I believe so I wouldnt be able to use a 10.5". But thanks for lookin' out! Cool

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Pilot bearing

Post  xschop on Mon Aug 10, 2009 9:53 pm

Go ahead and order that thicker bearing....Mine was 5.896 and I still could install the 15x35x14 pilot bearing.
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Re: 944-LT1 LS3 Conversion

Post  dallas on Tue Aug 11, 2009 6:43 am

Mine was just about 5 3/4. I documented with pictures in my gallery on hybrid9s.com. I also used the gto needle brg and cut the original adapter to fit. I ran into a problem with the bh not fitting right. had to grind out the area by the starter with a burr, to stop it from hitting the starter nose. Then the bh fit against the block all the way around.

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Re: 944-LT1 LS3 Conversion

Post  948 on Tue Aug 11, 2009 11:41 am

944-LT1 wrote:I know, I know, im a traitor to my kind
silent

I wish the idea of an LS was around when I started, so I don't blame you.........
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Re: 944-LT1 LS3 Conversion

Post  944ls on Wed Aug 12, 2009 1:21 pm

study

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Re: 944-LT1 LS3 Conversion

Post  944v8inDFW on Thu Aug 13, 2009 6:13 pm

MK
you might want to check [You must be registered and logged in to see this link.] I have had great luck with thier disks and they do have a 12.


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Re: 944-LT1 LS3 Conversion

Post  944v8inDFW on Thu Aug 13, 2009 6:16 pm

once you find one you like just copy and paste the number in a search at summit or jegs and BAM you got a "Custom 12 inch LS Series clutch disc with Porsche center spline" clicks away
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Re: 944-LT1 LS3 Conversion

Post  944-LT1 on Wed Dec 02, 2009 8:30 am

Almost forgot to update this thread. Shocked

So currently, the engine is in the car but sits a bit high and is FORCED forward of where the toquetube and tranmission mount want it. This is due to the motor mount uprights which are too long. Mad But, it is bolted up just simply a bit forced. Once the oil pickup tube and pan are fitted, I will measure the clearance from the bottom of the pan and x-member and cut and re-weld the uprights to allow the engine to sit where the drivetrain is comfortable which will also afford me more room for hood clearance.

Here is my current list of parts purchased and unpurchased that may help others:

Bellhousing adapter plate: XSchop
Bellhousing: GM 12554980 paid 100.00 corvetteforums
Throwout bearing/slave assy. : GM 89059282 paid 100.00 corvetteforums.com recieved 2 of them for 100.00
Flywheel: GM 12571611 120496901 paid 275.00 corvetteforums.com
Pressure Plate: GM 24248985 24238412 actual used is 24233085 paid above
Clutch disc: Centerforce# CTF-383946 or LuK/Valeo South Bend Clutch
Pilot bearing adapter: XSchop
Oil pan: Moroso 20140 paid 219.95 Summitracing
Thermostat housing: 170-911LS1C $39.99 Summitracing
Billet drop down spacers: McMaster Carr 6061 aluminum 30.00
Remote oil filter and hoses: paid 153.10 Summitracing
Clutch adapter/hose/fittings/speed bleeder: paid 107.45….90° 12mm to 3AN russells PN# R4054C Summitracing
Regulator/filter: NAPA# FIL3737 or GM 10299146 new number 19239926 or Wix 33737 or AC Delco GF822 $39.00 Ebay "NookandTranny"
Oil Pump pickup: Milodon 18290 $73 or Moroso 24050 $92
Harmonic balancer: GM 12620556 LS3 vette 12601402 40.00 corvetteforums.com
Engine motor mounts:
Fuse panel and relays for LS3 harness: Dorman 85668
Harness modification: Myself = Free!
Headers:
Oil Dipstick and Tube: Tube = 12570787 Dipstick = 12570788
Oil Cap:

And here are some pictures. These are thumbs, feel free to click for larger size:
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This is the adapter plate made by Rob (XSchop). You can see it is quite pretty and shiney! You'll also note that in order for the AN fittings and adapter fittings to clear this adapter plate, one must use a dremel with sanding wheel (or similar) to clear extra room. Maybe Rob will start doing this for future plates?
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Here is the Pilot Bearing adapter, also made by Rob, and bearings that are pressed into it. The skinnier bearing is the 35x15x11 mm version PN# 6202 RSR by FAG. The other is the thicker 35x15x14 mm version PN# 62202 2RS by FAG.
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This is my remote oil set-up which uses -10AN fittings, a Moroso 20140 pan and a regular off-the-shelf remote filter mount. This is all from summit. The push-tite fittings are awesome and require no special tools.

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Re: 944-LT1 LS3 Conversion

Post  gt1scca on Wed Dec 02, 2009 7:56 pm

944-LT1 wrote:...the engine is in the car but sits a bit high and is FORCED forward of where the toque tube and transmission mount want it. This is due to the motor mount uprights which are too long.
And you tried to reuse which mounts?
RH?

(Hmmm...The ones in the manual would have worked.)

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I searched for an hour on Summit and could not find those fittings

Post  Arthropraxis on Wed Dec 02, 2009 8:30 pm

Until I switched from push tite to twist tite on the search. Do you not have to modify the oil pan?
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Re: 944-LT1 LS3 Conversion

Post  gt1scca on Wed Dec 02, 2009 9:11 pm

Here's the "instructions"...

Remote Oil Filter Instructions

"Twist-Tite" is Summit's brand..."Push-Lok" I think comes from Goodridge.
Same type fittings...Mr. Gasket also makes them.

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Re: 944-LT1 LS3 Conversion

Post  944-LT1 on Wed Dec 02, 2009 10:53 pm

Im not entirely sure if the uprights are correct or not really. I need to get the pickup installed and the oil pan installed to see whats what. It may be correct where its at. Sure looks good where its at. Not sure. Just felt forced further forward than what I think it outta be and was a PITA to get the mount bolts through the x-member holes on either side. Basically, I tried to have the engine bolted up tight to the BH and TT and the crossmember (w/.5" spacers) tight with the frame rails.... No Go on getting the uprights int position like that at all. So, I loosened the x-member bolts and got them in that way. The engine, when the mount bolts are not all the way tight can be twisted left and right! Shocked Laughing

The oil pan clears everything fine which is ass opposite than what ive seen on the forum. Regardless, im going to notch it anyways to gain a bit more or shave some aluminum from the x-member. Again not sure until the pickup and pan is on kinda thing.

The oil lines/fittings are summit brand and I may be mistaken about the brand name but its something like that. Laughing

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Re: 944-LT1 LS3 Conversion

Post  Marky522 on Fri Dec 04, 2009 9:55 am

DBW is going to be expensive for the LS3 parts. You will need the Pedal, harness to the TAC modual, the TAC modual, and harness from TAC to PCM, and the LS3 TB. The Corvette parts carry a premium, where as I used a Truck harness, TAC, and TB MUCH cheaper but i had to mount my TB upside down to maintain hood clearance.

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Re: 944-LT1 LS3 Conversion

Post  gt1scca on Fri Dec 04, 2009 1:28 pm

Marky522 wrote:...I had to mount my TB upside down to maintain hood clearance.
Mark
Hint, Hint...

Great info, Mark!

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Re: 944-LT1 LS3 Conversion

Post  944-LT1 on Fri Dec 04, 2009 7:56 pm

Thaks Mark. The LS3 uses the E38 ECM which has the TAC module built in which means no TAC module/harnesses/etc. Just a straight shot from the pedal to the ECM to the throttle body. When I bought the engine, it came with the engine harness, E38 ECM, and the pedal assembly. Ive already modified the harness and found the wires that go to the pedal from the ECM so I believe Im good to go.

But thanks for the flip idea. Ill see if I can flip the throttle body to gain some clearance and let yall know. Very Happy

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Re: 944-LT1 LS3 Conversion

Post  944-LT1 on Sat Dec 05, 2009 3:53 am

Well, you can flip it but theres the steam crossover pipe that get in the way a bit. Would need to bend it a bit.

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Re: 944-LT1 LS3 Conversion

Post  HotShoe on Mon Dec 14, 2009 8:45 am

Forgive me if this is a stupid question because I am a rookie to this but are all these issues because you are trying to adapt the RH LT kit to the LS3?

I have an RH lsX kit I bought a year ago and have been planning on doing an LS3 crate also when my time frees up but I was under the assumption that the LS3 would drop in just like a LS1 or LS2. Does the RH LsX kit have to be modified to work with the LS3?

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Re: 944-LT1 LS3 Conversion

Post  gt1scca on Mon Dec 14, 2009 12:06 pm

The LS3 is a 6.2L LS series engine. The motor mount locations are the same as all LS blocks, PCM and harness are a little more elaborate, and no...The RH LT1 kit is not being adapted. Some existing SBC / LT1 parts have been modified for the LS applications, however...

The SBC / LT1 engine uprights have been proven to work with the LS blocks, and the rest of the LS "Kit" we have put together should also work with the LS3. The RH kit will also work with the LS3, due to the above listed fact of all LS series (4.8 and 5.3 LQ4 / LR4 / LM4 / LM7 / L59 / 5.7 / 6.0 / 8.1L) block similarities.

944-LT1 is basically using "generic" (for lack of a better term) LS parts, such as the oil pan, oil pump pickup, SBC motor mounts, C5 bellhousing, C5 clutch slave, and so on.

Have I missed anything 'LT1?


Last edited by gt1scca on Wed Mar 31, 2010 1:08 pm; edited 2 times in total

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