Shavin the block

1988starter · 03-01-2003, 06:43 AM

I tryed the serch function found little but I was wondering if you can shave the block at all to increase compression. I was curious because my friend took off a half mm from his saturn block and well it made a nice low end diff and well you know.

**88LXi68** · 03-01-2003, 07:09 AM

hmm I never heard of people shaving the block, but I have heard of people shaving the head to bump up compression.

**yaxley** · 03-01-2003, 07:21 AM

Its def shaving the head but I have also heard you can take a layer out of your head gasket to bump up compression(the gasket has three copper plys please correct me if I am wrong about the gasket. It might only be later model hondas with this gasket.)

**88LXi68** · 03-01-2003, 07:26 AM

Originally posted by yaxley
Its def shaving the head but I have also heard you can take a layer out of your head gasket to bump up compression(the gasket has three copper plys please correct me if I am wrong about the gasket. It might only be later model hondas with this gasket.)

I have heard the same thing about headgaskests. I am pretty sure our A20s work the same way. Less of a head gasket creates more compression. Thats why some people with turbos will run 3 head gaskets to lower the compression just enough to squeeze more boost.

**wikkedv15** · 03-01-2003, 07:58 AM

hehe i know this is a 3g board.. but
my sister got her head shaved and got a skinnier but stronger head gasket
the difference this made was insane...
the motor was rebuilt to stock trim when my step dad had it .. bucz it blew.. he told them to shave the head and skinnier gasket..
the car pulls... like wow:super:
3rd gear used to be from 55mph to like 75mph.. now the car redlines in 3rd at 82mph....

**yaxley** · 03-01-2003, 08:43 AM

Thanks for sorting that out for me 88lxi86 I thought so but was not positive. Free power is soooo cool.

**od2681** · 03-02-2003, 05:32 PM

wouldnt that be bad for the head gasket....and for the motor
if its not..then well im doin it too

**dXsquared** · 03-02-2003, 05:46 PM

its not free power... u dont use a hack saw in the back yard... it has to be done at a machine shop!

Travis

**88LXi68** · 03-02-2003, 06:29 PM

Originally posted by DXHATCHBACK
its not free power... u dont use a hack saw in the back yard... it has to be done at a machine shop!

Travis

I think he is talking about the head gasket.

**AccordEpicenter** · 03-02-2003, 10:12 PM

you can shave blocks too, its just more work. Shave too much on the heads and youll weaken them. BTW when you do shave either it tweaks your cam and ignition timing slightly.

1988starter · 03-03-2003, 09:31 AM

OK but does anyone know how much you can do it. A mm .5mm or what

**AccordEpicenter** · 03-03-2003, 01:58 PM

let me take a look in the factory service manual and see what I can find.

**89BadBoy** · 03-04-2003, 05:19 PM

a friend of my mine did this, it was a chevy 350 tho, he shaved the block so the pistons came up level with the block, i dont know how much he took tho

***carotman*** · 03-04-2003, 05:35 PM

the block can be shaved no problem. There are even guides on the block to show you where to stop

1988starter · 03-05-2003, 06:09 AM

Originally posted by carotman
the block can be shaved no problem. There are even guides on the block to show you where to stop

Thanks man because when I get the solara I wqas goint to remove the a20 and rebuild it nice and good. I was thinking of wiseco soft head pistons but am still undecided

**YK86** · 03-05-2003, 08:23 AM

Like mentioned above, when you shave the head alot, it retards the cam so you'll need an adjustable cam gear.

**smufguy** · 03-05-2003, 08:45 AM

wow, i never heard about this till now. So how much compression are you gaining anyway? and also is there gonna be a leak problem associated with this?

YASU: do we have adjustable cam gears to replace stock A20 gears?

1988starter · 03-05-2003, 09:03 AM

Originally posted by YK86
Like mentioned above, when you shave the head alot, it retards the cam so you'll need an adjustable cam gear.

I was thinking about that and possiable moving the actual belt instead of the gear.

As for compresstion my friends saturn went from a 9.3 to a 10.1 with some shaving but I am not sure for our blocks.

***AZmike*** · 03-05-2003, 09:49 AM

Where were you planning to move the timing belt to? You would need to remove a lot of material before you'd be exactly one tooth off.

1988starter · 03-05-2003, 01:39 PM

I ment just ajust it one tooth advanced.

**Low Tek** · 03-18-2003, 04:57 PM

so if I wanted to port and polish the head, what would I have to do to get the compression down to 8 or lower to run a 12psi turbo, and will the b16 intake manifold raise the compression too??
I know it pulls more after 3, but is that all??

what do you guys think?

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