seating head studs into cylinder...

[Steven]

Is there room to seat the head studs deeper into the holes in the cylinder? I was thinking I could tap to the bottom of the bolt holes if there is room to go any further. Anybody try this? Is there any draw back to this or will it even work?


I'm trying to make a little stronger top end for 11.5:1 compression.

Thanks!

[Steven]

need help guys

[nakomis0]

Find stronger bolts.

I don't know where you can get them, but I know you can.

[Teufel]

IMO, stronger bolts aren't going to help. The threads in the aluminum head is the weak spot. They will let go long before that stud ever weakens. Using a longer stud would help, but I don't know how much deeper you can go before getting in trouble.
I would call Mickey Dunlap or one of the four stroke guru's and ask first. Personally I haven't heard of the problem with the 400.
It is more likely that they be damaged from over torquing.

Just my opinion

[Steven]

thanks for the input fellas, anyone else

[Extremeracer167]

TC Racing sells a better stud kit then stock. Thats what alot of the guys with big bores are running. The stud kit goes for $80 and they are longer and wider to get a better plant in the aluminum. Def. worth the money!!

[phatswinn]

borrow one the of the $80 studs from you buddy and go to home depot and buy the same bolts for 80 cents each

[RED121572]

Originally posted by phatswinn
borrow one the of the $80 studs from you buddy and go to home depot and buy the same bolts for 80 cents each

:eek: :huh I dont know, but chya better not.


And its the bolts that will stretch, not the threads in the head. (if installed properly)

http://www.exriders.com/vbb/attachment.php?postid=376297

[deansfastway]

Yes Steven you can get a 10x125mm bottoming tap or a regular tap and grind the end flush and tap the holes a bit deeper you might gain like 2 or 3 threads we always do this also when we mill a cylinder top as the studs could ride too high and the capnuts could bottom out before the torque is acheived . I now like to turn the cylinder base instead of milling or grinding the tops to set the piston height. Those holes can get dirt or metal in them and keep the studs from settling . McMaster Carr sells longer 10x125 helicoils if you need those.The factory manual has an actual stud height protrusion table for checking the studs but most people have never seen that . Good Luck

[Steven]

Which one guys... new TC studs or tap the OEM's deeper into the sleeve.

I looked at the TC studs. They are 2mm longer and the same diameter as the OEM studs. Worth $80.00? Thats hard to justify.

Convince me one way or the other.

[Steven]

need more input gents...

[nakomis0]

If you use OEM, I would use new ones and not re-use the old ones.