Raise Compression - Honda Forum / Acura Forum

HondaVTEC93 · 08-14-2005, 10:46 PM

What's the best route to go to raise compression?

No poop stuff....just spill the facts and shoot out ideas.

Thanks ppl.

Leitner · 08-15-2005, 03:59 AM

pistons are where you should start. but many people will say cut the head and yes that is the easiest way. to me pistons are the starting point but hat requires a rebuild.

Mr.60trim · 08-15-2005, 06:05 AM

Quote:

Originally Posted by Leitner

pistons are where you should start. but many people will say cut the head and yes that is the easiest way. to me pistons are the starting point but hat requires a rebuild.

"Cut the head"

Explain?

kommon_sense · 08-15-2005, 07:20 AM

Quote:

Originally Posted by Team_Carnage

"Cut the head"

Explain?

Milling the head. This makes for a smaller combustion chamber which in turn raises compression. I'm not really a fan of this method.

If you really want to raise compression, then pistons are the way to go.

Mr.60trim · 08-15-2005, 08:30 AM

Quote:

Originally Posted by kommon_sense

Milling the head. This makes for a smaller combustion chamber which in turn raises compression. I'm not really a fan of this method.

If you really want to raise compression, then pistons are the way to go.

Ahhh...I C. Very interesting. Why are you not a fan? Possible damage could happen or something of that nature?

98vtec · 08-15-2005, 08:52 AM

Quote:

Originally Posted by Team_Carnage

Ahhh...I C. Very interesting. Why are you not a fan? Possible damage could happen or something of that nature?

you have to worry more about piston to valve clearance when you mill the head.
You can only mill it so far before the valves hit the piston. Thats why if you mill the head then eventually throw high compression pistons in there, it "limits" you to what compression you can run.

Mr.60trim · 08-15-2005, 09:41 AM

Quote:

Originally Posted by 98vtec

you have to worry more about piston to valve clearance when you mill the head.
You can only mill it so far before the valves hit the piston. Thats why if you mill the head then eventually throw high compression pistons in there, it "limits" you to what compression you can run.

That makes sense

kommon_sense · 08-15-2005, 09:46 AM

Also, once you mill the head, that is material that you can *NEVER* add back and it does have a small impact on your cam timing.

It also limits how big of a cam you can run and you are also reducing your piston to valve clearance.

Don't get me wrong, milling works. I'd just rather pick my compression by using the right piston.

HondaVTEC93 · 08-15-2005, 06:43 PM

yeah exactly...i would never mill it. maybe some ctr pistons and a gsr crank. some buddyclub spec III's was more what i was thinking...that would put me in the 12's

sleeper15 · 08-15-2005, 07:48 PM

I did both. I milled my head, and added some High comp slugs. Unfourtnitly, i can't run any bigger cams then what i'm running now (Crower 402). Like kommen_sense says, once you mill the head, you can't changed what you did. It's a step you really have to be sure of.

Blood · 08-25-2005, 02:49 PM

How much would you gain by just going with a thinner head gasket

98vtec · 08-25-2005, 08:14 PM

i havent read up too much on shaving the head but i would say if you shaved it 30 thousandths, that would prolly up the CR another half a point or so....so like 5 whp?

danmakG60 · 08-25-2005, 08:49 PM

1)mill head : requires adj. cam sprockets

2)pistons

3)thinner head gasket

98vtec · 08-25-2005, 08:51 PM

Quote:

Originally Posted by danmakG60

1)mill head : requires adj. cam sprockets

why is that?

Milling the head has nothing to do with timing.

danmakG60 · 08-25-2005, 08:55 PM

Quote:

Originally Posted by 98vtec

why is that?

Milling the head has nothing to do with timing.

Yes it does, you are making the head shorter thus putting the timing belt in another position. With a sprocket you can return your cam timing to exactly how it was before.