this is for a 6-700 hp engine. discuss...

 

Studkit!

More exspensive but worth it..

 

extra dowels you're dealing with the possibility of improper machining......

 

true. besides tublown, who else offers a stud kit?

 

this is tru, if you don't let the pro's handle it. my xtra dowels were done by protech performance (ausin tx) we made a real nice jig so that it's perfect EVERY TIME, and it's done the job n thensome w/ my setup only (2) xtra holes (4) pins

 

mazdatrix had a stud kit but i just tried their website and it didnt work.

 

I've installed the mazdatrix stud kit (the one that doesnt require machining) on a few customer's motors. Install was a breeze, no idea if it makes a difference

http://www.mazdatrix.com/STUDKIT.HTM

$481, ouch.

 

I believe Aspec offers a stud kit but requires machining

 

what e-shaft are you going to run. everytime i get above 480hp at the wheel the e-shaft ends up twisting lost 2 motors that way

 

did you have your engine dynamically balenced?

thanks for the input guys, looks like ill be trying the stud kit.

 

It helps i can wouch for it hehe. The stock size stud kit is good for about 7-800hp.

Dowels are just crap. I had it in my old engine, gave me so much headache.

And 481$ aint that bad. It's a good investment. Studs rock

JT

 

thats the kinda stuff i wanna hear. turblown has them for $350 incase anyone was wondering.

 

dregg100, I have the upgraded version from mazdatrix. If you want I can sell them to you. Ill take off $100.00 from the top. They are brand new. I brought them to cam and he didnt want to put them in, said it was going to be a hassle to machine everything.
But those things are THICK!
IM me if your interested.

 

The High Strength Oversized stud kit eliminates the need for doweling the engine block. All studs act as dowels which massively increases torsionial strength 70%. Rotor housing deflection reduced - increases apex seal life. Less material machined from housings and plates than with doweling, reducing the possibility of cracking. High boost engine expansion reduced. Studs are less prone to stretching under high boost applications. More accurate tensioning of engine. Less chance of bolt breakage. High quality 12-point nuts rated at 180,000 PSI tensile strength. Studs manufactured from 4140 chrome moly, heat treated, centreless ground and black oxided. Engine must be accurately drilled, reamed and tapped to give 0.2mm clearance.

*Note: The standard factory manual flywheel cannot be used with the Stud Ki

 

Bad bad advice If the stud kit was so bad people running 7 seconds in the 1/4 wouldn't be using them with such success they don't build the engines without adding dowel pins. Secondly the stock size stud kit does nothing because the motor can still torque and flex causing a cracked dowel land. If you want the stud kit to work you need to get the over sized kit that requires machining.

/thread.

 

i understand how the oversized kit will work great, but who can i trust that will machine if right? and do they install like the factory dowels?

radiant rx7, i may be in contact with you.

 

https://www.rx7club.com/rotary-drag-racing-167/question-about-aftermarket-engine-stud-stock-size-773043/

 

I really needed a good laugh today.....Thanks!

 

That's not nice!

 

Why? They are a bugger to use. I had 4 dowels in my engine before with very thigth clerance. And it was a pain in the *** to get the engine apart and together.

Ofc dowels do help. But they are a crap to work with. The stock size studs are great as they are stronger and holds the engine together, compeard to the stock studs.

With the stud kit it's even a bigger pain to use. So i won't use it ever again. Iv'e not had problems with the studkit so far. Dynoed 530rwhp on a mustang dyno at 1.3 bar with a T04Z and E85 so the pressure should be there.

JT

 

A-Spec has the cnc program to do it.

good for 4,000 hp

 

I'm not going to get into a detailed explanation as people will only argue with me over it but the real answer to this question is determined by the direction of loads within the engine. They're not what most people think they are. This thread as a whole cracks me up based on some answers as well as the "logic" behind a particular answer. I design pumps of up to 2200 hp all day at work and understanding loads and the direction that they are applied at has really been eye opening when it comes to rotaries.

 

go for it man, I need some drama to read today

 

Please enlighten us! Don't hold back the good info! That is how this place gets overrun with fouled logic and misinformation!

 

You guys are missing the point here.. The biggest Benefit of the 12.7mm oversize kit is the clamping strength... and that when machined to the correct tolearnces each stud acts like a dowel pin which also helps to keep the motor from twisting/cracking side plates.. On real BIG HP setups (track cars ) you should still do all oil mods so that if by chance you still crack a sideplate you dont spew oil from the motor which could cause a crash...