HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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C5 Bellhousing Differences

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C5 Bellhousing Differences

Post  gt1scca on Thu Dec 03, 2009 1:46 am

Here we go again...

The Corvette C5 2-piece bellhousing is a hot item these days. It seems there exists another C5 bellhousing that no one is sure about, and at one time it was thought to be an auto-trans bellhousing.

I have a GM #12551118 (1-piece) bellhousing for my LT1 setup. Inside dimensions are larger than the SBC bellhousing, so a 168T flywheel and 11.0" clutch will be accommodated. All the rage has been "The 2-piece design allows removing the lower section for component inspection and proper torque tube alignment"...

News Flash...

These bellhousings have been sold used with CRACKS in them. Are they worth the risk?
The early C5 bellhousing is a 1-piece design, but features a hulking 2" X 4.25" oval inspection hole @ the bottom. The 1-piece design is definitely stronger...Have you ever seen a SBC cast bellhousing crack (unless subjected to enormous shock load)? The removable lower section may be a nice touch, but it isn't worth much on a cracked bellhousing...

On to the big deal...

The GM #12551118 (1-piece C5 BH) will work with up to a 12.0" clutch setup, is stronger than the GM #12554980 (2-piece C5 BH), and is dirt cheap ($35 on eBay today).

Here's the drawings (drawn to scale, exported as jpegs) and pics.
Note that the #12551118 BH will require minor machining for the clutch slave hoses.

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Re: C5 Bellhousing Differences

Post  gt1scca on Thu Dec 03, 2009 2:27 am

A few shots of the hydraulic line reliefs in the 12554980.

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This should look familiar to some of you...

Razz

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Re: C5 Bellhousing Differences

Post  87-944S on Fri Dec 04, 2009 6:00 pm

Greg,

You never cease to amaze me with the information and detailed drawings you supply! Do you ever sleep? I'm feeling a bit inadequate in the bellhousing area now. Laughing

Mike
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Re: C5 Bellhousing Differences

Post  gt1scca on Fri Dec 04, 2009 7:27 pm

87-944S wrote:Greg,
...Do you ever sleep? I'm feeling a bit inadequate in the bellhousing area now.
Mike
Thanks Mike...

SLEEP?...Wa' Dat?
The first 3 months of Kyle-dom broke me from that!

Don't get too worked over about the bellhousing...

"A solid two-piece is a far better show than a one-piece...
especially if it's put together right..."


Razz Razz Razz

gt1scca

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BH Q:

Post  968gene on Mon Dec 14, 2009 6:46 pm

Are the manual BH and the Auto different? The auto looks a great deal like the early one piece you posted (12551118).
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Re: C5 Bellhousing Differences

Post  gt1scca on Mon Dec 14, 2009 8:04 pm

Slightly...

My drawings are done to scale for comparison. As mentioned, the "Auto" bellhousing will contain a 12" (11.75" disc diameter) clutch assembly. From what I've seen, they are cheap, but lack the benefit of the 2-piece design.

The main benefit of the 12554980 (Manual) BH is only for inspection...
You can't remove or replace anything with it in place. The cast-in oval hole on the Auto BH (12551118) is for torque coupler access on the Corvette, but should serve as an adequate inspection hole for 944 V8 applications.

A bargain is a bargain:
This one comes with added strength.

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what am I missing?

Post  968gene on Mon Dec 14, 2009 8:18 pm

It looks like the two drawings are labeled incorrectly. The shape of the one piece design is labeled two piece and the two piece, one piece. I'm thinking about going this way too. Anyone want to buy my two piece C5 BH? (complete with inspection cover bolts)
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Re: C5 Bellhousing Differences

Post  gt1scca on Mon Dec 14, 2009 8:53 pm

The drawings are (partial) cross-sections.

2-piece design is more of a "bell" shape than the 1-piece, but the inside dimensions are roughly the same where the pressure plate resides.

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Re: C5 Bellhousing Differences

Post  gt1scca on Mon Dec 14, 2009 9:09 pm

968gene wrote:Anyone want to buy my two piece C5 BH? (complete with inspection cover bolts)
Post it in the For Sale section, and kiss it Bye Bye.
I get emails constantly looking for a line on a bellhousing...

WTB posts are popping up on CorvetteForums also.

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c5 bellhousing

Post  komradekozik on Tue Dec 29, 2009 4:22 pm

Will a corvette c5 bellhousing bolt onto a 5.3 Vortec Block?

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C5 Bellhousing and Adapter

Post  968gene on Tue Dec 29, 2009 4:44 pm

komradekozik wrote:Will a corvette c5 bellhousing bolt onto a 5.3 Vortec Block?

All day long.....
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Re: C5 Bellhousing Differences

Post  komradekozik on Tue Dec 29, 2009 5:04 pm

oh alright thats good to know, would you say that a 5.3 truck engine be a decent alternative to an f-body ls1? considering that the intake and accessories need changed?

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5.3 vs. LS1

Post  968gene on Tue Dec 29, 2009 5:15 pm

5.3 = much less expensive ($500?), most LSx parts are a bolt on so you can source parts inexpensively (LS1 intake is $50, TB $50, Truck ECU $75, etc.) If you are lucky, you can find an L33 or other aluminum 5.3 for cheap too. Can make 400+ HP easy.

LS1 = more expensive, (if cheap probably abused).

LS2, LS6, LS7 = more $$$.

Buy everything at once. Get the engine, harness, ECU (PCM), etc. etc.
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Re: C5 Bellhousing Differences

Post  komradekozik on Tue Dec 29, 2009 5:20 pm

will the 5.3 harness plug into the LS1 stuff?

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Re: C5 Bellhousing Differences

Post  gt1scca on Sun Jan 03, 2010 3:25 pm

To get back on topic...

Here's what I have learned with the 12551118 BH:

To use this bellhousing on a SBC / LT1 engine, a high-torque stater ([You must be registered and logged in to see this link.]) must be used. I bolted my 12551118 BH up to the '96 LT1, and the stock starter is now scrap. The stock GM starter nose-cone will not clear the bell, and the HT starter does not utilize the nose-cone.

The same starter problem will likely exist on the LS engine, but it is being verified.
For the 12554980 (2-piece) BH, starter design and location is not an issue.

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Re: C5 Bellhousing Differences

Post  gt1scca on Thu Jan 07, 2010 9:04 am

gt1scca wrote:The same starter problem will likely exist on the LS engine, but it is being verified.
Confirmed, and here's the fact, Jack...
The MSD starter will work.

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[You must be registered and logged in to see this link.] (For the SBC / LT1)

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Other gear reduction starters will give similar results. The MSD starters were listed because of the P/N used for test fitting. No affiliation, of course...

(Thanks Mike!)

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Re: C5 Bellhousing Differences

Post  UltimatE on Sat Sep 01, 2012 10:10 am

gt1scca wrote:Slightly...

My drawings are done to scale for comparison. As mentioned, the "Auto" bellhousing will contain a 12" (11.75" disc diameter) clutch assembly. From what I've seen, they are cheap, but lack the benefit of the 2-piece design.

The main benefit of the 12554980 (Manual) BH is only for inspection...
You can't remove or replace anything with it in place. The cast-in oval hole on the Auto BH (12551118) is for torque coupler access on the Corvette, but should serve as an adequate inspection hole for 944 V8 applications.

A bargain is a bargain:
This one comes with added strength.

Old thread, I know... But have a question regarding the auto bell housings. I'm beginning my conversion, and looking for a BH. While looking at autotragic bell housings on ebay, I noticed they don't have the relief cuts for the slave cylinder hydraulic lines.

Is there anything else different? Is there enough material in that area to machine two slots for the hydraulic lines?

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Re: C5 Bellhousing Differences

Post  xschop on Sat Sep 01, 2012 10:24 am

You can notch it. The problem with the 1-piece Auto C5 bellhousing is you can only fit a 10.5" clutch.
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Re: C5 Bellhousing Differences

Post  superman22x on Thu Dec 17, 2015 7:11 pm

Sorry to bump an old thread, but a 10.5" clutch is max? The OP was able to fit a 12" flywheel, but maybe that is only for the SBC/LT1?

As far as starters, an OEM C5 starter should work just fine. No difference in part numbers between the auto and manual on Rockauto. GM loves to reuse parts between platforms.

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Re: C5 Bellhousing Differences

Post  Christopher Moffett on Sat Mar 04, 2017 9:04 pm

gt1scca wrote:Here we go again...

The Corvette C5 2-piece bellhousing is a hot item these days. It seems there exists another C5 bellhousing that no one is sure about, and at one time it was thought to be an auto-trans bellhousing.

I have a GM #12551118 (1-piece) bellhousing for my LT1 setup. Inside dimensions are larger than the SBC bellhousing, so a 168T flywheel and 11.0" clutch will be accommodated. All the rage has been "The 2-piece design allows removing the lower section for component inspection and proper torque tube alignment"...

News Flash...

These bellhousings have been sold used with CRACKS in them. Are they worth the risk?
The early C5 bellhousing is a 1-piece design, but features a hulking 2" X 4.25" oval inspection hole @ the bottom. The 1-piece design is definitely stronger...Have you ever seen a SBC cast bellhousing crack (unless subjected to enormous shock load)? The removable lower section may be a nice touch, but it isn't worth much on a cracked bellhousing...  

On to the big deal...

The GM #12551118 (1-piece C5 BH) will work with up to a 12.0" clutch setup, is stronger than the GM #12554980 (2-piece C5 BH), and is dirt cheap ($35 on eBay today).

Here's the drawings (drawn to scale, exported as jpegs) and pics.
Note that the #12551118 BH will require minor machining for the clutch slave hoses.

[You must be registered and logged in to see this link.]

[You must be registered and logged in to see this link.]

[You must be registered and logged in to see this link.]

[You must be registered and logged in to see this link.]





Can you make your own oil pan instead of buying the one that's $500

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Re: C5 Bellhousing Differences

Post  Christopher Moffett on Sat Mar 04, 2017 9:05 pm

gt1scca wrote:Here we go again...

The Corvette C5 2-piece bellhousing is a hot item these days. It seems there exists another C5 bellhousing that no one is sure about, and at one time it was thought to be an auto-trans bellhousing.

I have a GM #12551118 (1-piece) bellhousing for my LT1 setup. Inside dimensions are larger than the SBC bellhousing, so a 168T flywheel and 11.0" clutch will be accommodated. All the rage has been "The 2-piece design allows removing the lower section for component inspection and proper torque tube alignment"...

News Flash...

These bellhousings have been sold used with CRACKS in them. Are they worth the risk?
The early C5 bellhousing is a 1-piece design, but features a hulking 2" X 4.25" oval inspection hole @ the bottom. The 1-piece design is definitely stronger...Have you ever seen a SBC cast bellhousing crack (unless subjected to enormous shock load)? The removable lower section may be a nice touch, but it isn't worth much on a cracked bellhousing...  

On to the big deal...

The GM #12551118 (1-piece C5 BH) will work with up to a 12.0" clutch setup, is stronger than the GM #12554980 (2-piece C5 BH), and is dirt cheap ($35 on eBay today).

Here's the drawings (drawn to scale, exported as jpegs) and pics.
Note that the #12551118 BH will require minor machining for the clutch slave hoses.

[You must be registered and logged in to see this link.]

[You must be registered and logged in to see this link.]

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Would an au5omatic c5 bellhousing work

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Re: C5 Bellhousing Differences

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