[quote name='T88rx7' date='Jun 25 2005, 10:45 PM']see i go over a little factory specs when im putting on a head on a piston motor that is making more then half its factory hp, for example i worked on a 2jz motor that was making over 1000 hp and he alwasy blew a gasket, so the next time i tighten the head a little more but not drastically he didnt get that problem even when he maxed out the 5 bar map sensor, when he spiked the gastget was good but the cylinder wall cracked. I was just thinking if this would come to play in a rotary motor too?


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so what are you trying to fix by running tighter/looser? it might be better to use the factory spec, than to do something different and cause a different problem?



my friend goes up to 30lbs if the motor is gonna make a bunch of power (300-400hp), or its got shitty housings, he hasnt had any problems.

[quote name='Old Splatterhand' date='Jun 25 2005, 06:16 PM']torque specs interest me as well

lower tq for the added growth due to higher temps?

or higher tq for higher overall tension?


[/quote]



The bolts are heated along with the rest of the engine, right?



Don't store your tension bolts in the oven with your housing in the freezer and the factory specs should always apply (with reason).

[quote name='Shotgun' date='Jun 27 2005, 12:38 PM']The bolts are heated along with the rest of the engine, right?



Don't store your tension bolts in the oven with your housing in the freezer and the factory specs should always apply (with reason).


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finally... god damn.



https://www.nopistons.com/forums/pub...1047683358.gif https://www.nopistons.com/forums/pub...1047683358.gif https://www.nopistons.com/forums/pub...1047683358.gif https://www.nopistons.com/forums/pub...1047683358.gif

I run it a little tigher than factory, which is like 29 lb-ft?

I normally run it up to 32 - 35 lb-ft, but there's really no reason to do so. https://www.nopistons.com/forums/pub...IR#>/smile.png

Running it *too tight* does inhibit the motor from turning properly. :(





-Ted

http://fc3spro.com/

I would rather blow a head gasket than crack a cylinder wall, but that's just me. When hitting the tension bolts I am usually with Ted on this one. I run 30lbs on stock tension bolts and 32lbs on the studded assemblies. I know of others who run 35lbs on studded assemblies. Keep in mind torque specs will vary significantly with wet or dry. Just because your gonna put more power through the motor doesn't mean you should preload the tensioner/fastener even more.

[quote name='RETed' date='Jul 7 2005, 03:18 AM']... which is like 29 lb-ft?


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correct... ive used 32 on stock new tension bolts...