Main cap walk with aluminum block
06-18-2005, 04:53 PM
#1
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Main cap walk with aluminum block Hey guys we have a customer that has 2 LS1 motors. Both engines have been ran above 750rwhp for a while now. When he pulled the motor he has noticed some main cap walk. We are wondering if any of you others running big #'s are seeing any evidence of this after sustained constant abuse? Please post up any results you may have. I know the iron block will have a little better result, but some folks rather lighten the car as much as possible. Let us know what you have found.
06-18-2005, 05:06 PM
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Flexing my son...flexing. The force from the crank trying to come out the bottom of the block is quite great at 750+rwhp...lol. Thats one reason why I'm asking if anyone else has seen this problem with sustained abuse.
JZ
JZ
06-18-2005, 06:18 PM
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Don't see how pins would help very much. We have discussed doing a full blown main cap girdle for the LS1 blocks. Bolting all the caps together and into the block would make it darn near bullerproof. The Buick guys have done them for years, and they work awesome. I have a girdle on my GN as well. I am checking into this...just didn't know if others have been having the same problems but just keeping quiet.
Here is an example of the GN girdle....
Jose
Here is an example of the GN girdle....
Jose
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06-18-2005, 06:27 PM
#8
Yeah there is a guys selling a girdle on ebay for our cars I bought one never used it sold it and I will say it was a nice peice but when assembleing you have to remember to touque them in the same sequence and with the same touque as when you have it line honed etc... Just a piece of advice so do with it what you will. W2W makes one in house for there hight HP cars and I know of a few others that have run them some had oil leaking cause of the design and the one I bought fint between the block and didn't interfear with the oil pan gasket so it wan't going to be a problem with leaks just don't know if it is worth the money or not ?????? Good luck.
Jeff
Jeff
06-18-2005, 06:35 PM
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If we make one, it will include all mounting studs and gaskets. Also the one on ebay only ties the caps together. Which is nice, but it needs to be tied into the block like the GN girdle does for maximum strength.
Jose
Jose
06-18-2005, 07:56 PM
#11
I understand what you are talking about being tied to the block , but as a whole I dought there is much movement if any movement with them with even with this Girdle not all the pistons and rods are going in the same direction at the same time and this sits right against the block not tied to it like you said, but as a whole the main caps being tied together will solve a lot of movement Because the main studs go into the block. I am not saying this is stonger (I know that fastening it to the block is stronger.) just that it may serve the same results. I am not an engineer, but I do see other propblems makinig it tie to the block such as oil issues as the presured oil goes through the pan and sealing it where it won't leak (One of my biggest pet peaves.) and also clearance issues with aftermarket K-member and even stock k-members possibly not shooting your idea down at all as a mater of fact I would urge you to make one who knows yours maybe the best on the market although a limited market, but one that is growing. Let us see it when yours finished.
Jeff
Jeff
06-18-2005, 08:01 PM
#12
Oh and the Ford guys have been using them for a long time with a little success from what a couple of Ford guys told me that it just cut down on the Harmonics and basicly kept the block in one piece when they broke, but the blocks were still breaking under more than average hp.
06-18-2005, 08:36 PM
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Originally Posted by Inspector12
Oh and the Ford guys have been using them for a long time with a little success from what a couple of Ford guys told me that it just cut down on the Harmonics and basicly kept the block in one piece when they broke, but the blocks were still breaking under more than average hp.
Yep. The girdles do not work worth a **** on Ford 302 blocks. Even though it seems like it would help a ton, the blocks break in half at about the same power level, somewhere around 600hp, give or take.
I do know they've worked great for the buick guys.
06-18-2005, 10:06 PM
#17
http://www.exoticperformanceplus.com...Car.php?car=27
Here's a car where they used a girdle... seems like a good idea, I'll probably end up doing it on my build up as an extra precaution... never thought about the oil pressure making it leak though... anyone else run into that problem?
Here's a car where they used a girdle... seems like a good idea, I'll probably end up doing it on my build up as an extra precaution... never thought about the oil pressure making it leak though... anyone else run into that problem?
06-19-2005, 01:19 AM
#19
Originally Posted by Inspector12
How long has your car been together BigMike? how it running?
is getting an FMIC and Meth system. He told me on Thursday he was delivering the FMIC to Ft.Wayne on Sat. They plan to turn it up a few more PSI after that and shoot for the 750 range. He's hoping to get it back next weekend tuned and finished.
06-19-2005, 10:12 AM
#20
Originally Posted by Public
Mikes car: http://www.exoticperformanceplus.co...tCar.php?car=27
is getting an FMIC and Meth system. He told me on Thursday he was delivering the FMIC to Ft.Wayne on Sat. They plan to turn it up a few more PSI after that and shoot for the 750 range. He's hoping to get it back next weekend tuned and finished.
is getting an FMIC and Meth system. He told me on Thursday he was delivering the FMIC to Ft.Wayne on Sat. They plan to turn it up a few more PSI after that and shoot for the 750 range. He's hoping to get it back next weekend tuned and finished.
That's not my car. My car is not together yet Inspector12. We should have it running by the middle of July. I am running a 9x.mm turbo and will be shooting for ~1600HP, using the girdle mentioned above. You guys will hear all about my setup once its up and running.
