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Coolhead flex ???


Guest Vince27

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Guest Vince27

all stud have been removed , put all  helicoil to be sure no stud lift 

head have been torqued to  18 pound ...snap on electronic torque wrench ...

 

and everytime we run 3-4 dyno run without load or brake ......   No problem at all 

At the moment We pull  a run with load the oring blow ... All the Time at same place betwin the 2 stud  exhaust side ...

we  

Check the head with a staight edge all good ! ....

 

 

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3 hours ago, Guest Vince27 said:

all stud have been removed , put all  helicoil to be sure no stud lift 

head have been torqued to  18 pound ...snap on electronic torque wrench ...

 

and everytime we run 3-4 dyno run without load or brake ......   No problem at all 

At the moment We pull  a run with load the oring blow ... All the Time at same place betwin the 2 stud  exhaust side ...

we  

Check the head with a staight edge all good ! ....

 

 

Can you use a gasket instead of an o ring? 

Edited by Deets
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Are these off the shelf oring? As in are you guying at Zatkoff are someplace similar? Is it possible you need an oring of a different durometer? That is going to be my best guess is you need a harder oring. Also it is important if this is not a mono block to torque the head before torqueing the base gasket.

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  • 3 weeks later...
Guest Vince27

yes its a monoblock .. Cheetah 535 ...this Is the first Time i see a problem like this ...

The oring We put on are viton one suppose to be the best one ....

its like the head dont hold pressure when We put the brake on dyno or push hard on load ...

the oring blow up close the center exhaust side ...

 

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On 2/19/2020 at 7:26 PM, Guest Vince27 said:

all stud have been removed , put all  helicoil to be sure no stud lift 

head have been torqued to  18 pound ...snap on electronic torque wrench ...

 

and everytime we run 3-4 dyno run without load or brake ......   No problem at all 

At the moment We pull  a run with load the oring blow ... All the Time at same place betwin the 2 stud  exhaust side ...

we  

Check the head with a staight edge all good ! ....

 

 

There are many variations of viton. Yours is too soft I am guessing. 

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