has anybody just shaved there cyl. head down a bit , rather than replacing the
piston to gain compresion???? or both??? and how much of a change is possable??????

 

Don't do it!!!

You'll throw off your cam timing and once you do it there's no going back. I've heard of guys doing this and it has caused many issues.

Pay the extra money for a quality high compression piston from, Ron Wood, TVI, Team Pami, The Bom Racing, HP Research, On-Dunes Performance, etc. (I feel like a Nascar driver that just won the race naming all the sponsors.)

 

don't dooooo ittttttttt


Duneme is exactly correct. Overhead cam motors can't shave the head to increase compression. Well.... they can, but the chain length must me shortened, the cams have to be re-timed and most likely re-pinned.... WAY more expensive than a new piston.

Save the cash, and spend it on a good one.

 

i thought hpr said u can run extra gaskets to reduce piston compression. if it true, then it must not screw up your cam timing

 

eRo, are you listening to yourself?????

Not flaming, but think about what you said. If you install a thicker gasket, then the shave-down of the head will no exist....... why shave the head only to put a thicker head gasket in? The reason we put thicker head gaskets in is to fix the problem of not heaving a good head spec.

I hope that I'm articulating my self successfully.

Take material away from the head to gain compression
Then put it back so that cam/timing issues are erased

Did the light go on? Don't take offense just trying to reel you back a bit.

 

my point was not taken, the cam timing shouldn't be effected by a slight difference made either by shaving the head down or adding another gasket. at least that is what i have read on here ....

 

I think what eRo is speaking of is people getting a HPR 14:1 piston and putting a spacer-plate under the cylinder to get to 11:1 compression. All this without shaving the head.

Not sure why you wouldn't just buy an 11:1 piston unless it was just that someone didn't make one???

I think I've heard of this as well. People running a spacer plate to reduce compression.

Again, no-thanks!

I think the original poster was looking for a lower cost alternative and I think we've pointed him in the right direction. . . pay the money for a quality high compression piston.

 

Duneme, that what I thought the author was getting at. Maybe I missed eRo's point.... who knows.

To the author.... don't do it. It's not like a chevy v8..... Get the piston from someone who is proven in the field.

Let us know if you have more questions.

 

I woudnt do it either but.........

Cam chain tensioner.....does this turn on a light in the subject?