LQ4 main caps
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From: Denton, Texas
LQ4 main caps Anyone here ever have a main bearing cap just fall out of an engine? Of all the engines I've built in the last four years I've never had that happen until I disassembled my 408 after it started making odd noises. Normally they are wedged in the block but the 2nd from the front one just fell over when I pulled the bolts out. 
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TECH Apprentice
iTrader: (9)
Joined: Mar 2004
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From: Denton, Texas
There was no friction holding it in place. It is too short to fit snuggly between the rails of the block. I pulled the bolts out and it just rocked over against the counterweights of the crankshaft.
loose cap That main cap is sprung. The cause, possibly detonation related.
You may want to consider having steel caps installed on that block if it is a forced induction or nitrous engine. The alternative is to get a good used cap on there and align bore the block.
Steve
You may want to consider having steel caps installed on that block if it is a forced induction or nitrous engine. The alternative is to get a good used cap on there and align bore the block.
Steve
Originally Posted by Red Heartbeat
There was no friction holding it in place. It is too short to fit snuggly between the rails of the block. I pulled the bolts out and it just rocked over against the counterweights of the crankshaft.
__________________
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
replacement steel caps The originals are powdered metal.
Steel caps are available from Pro-Gram Engineering and Callies.
The steel caps need to be fitted to the block via align boring.
Steve
Steel caps are available from Pro-Gram Engineering and Callies.
The steel caps need to be fitted to the block via align boring.
Steve
Originally Posted by Red Heartbeat
Where do you get steel replacements? Are the originals powdered metal?
__________________
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
Thread Starter
TECH Apprentice
iTrader: (9)
Joined: Mar 2004
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From: Denton, Texas
I found some but they must be made of gold at $550 a set. The boss says they're made out of that new exotic material UNOBTAINIUM. 
Last edited by Red Heartbeat; Apr 3, 2007 at 01:21 PM.
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steel caps You should be able to find a set for around $500 racer net. Try some of the sponsors like Thunder Racing.
I warn you that the main expense is the installation. This has to be done correctly.
Steve
I warn you that the main expense is the installation. This has to be done correctly.
Steve
__________________
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
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