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Old 23-01-13, 10:53   #1
5LEEPR
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Lower compression without using a decompression plate?

Is there anyway possible you can lower compression without using a decomp plate?

Thanks,

Steve
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Old 23-01-13, 11:01   #2
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Machine the tops of the n/a pistons.
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Old 23-01-13, 11:27   #3
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Put a thicker gasket on.

Port the compression rings with a sand ingestion through the intake. Rev car in park/neutral to the limiter and throw handfuls of sand at the throttlebody.
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Old 23-01-13, 12:28   #4
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I'm going to have to attempt the sand ingestion!

But in all realness I think I'll just mount a thicker gasket, seems the easiest option.
Thinking 1.7mm or 1.9mm?

Thanks for the help boys, appreciate it,

Steve
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Old 23-01-13, 13:38   #5
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haha legend, depends on how much you want to drop it but you won't get a heap out of it with a head gasket alone.

If you have a good fuel system and good ECU well tuned, 9.5:1 compression with the quality fuels available shouldn't be too much of a problem.
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Old 23-01-13, 14:18   #6
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Thanks for the info mate, it all helps.
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Old 23-01-13, 14:53   #7
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Machine the tops of the n/a pistons.
don't laugh, the first engine I had built for me by Millen Engine Development (ingleburn) did just that.

They got 6 used pistons from one engine, two odd ones from another and dished them to drop the comp down to 7.2:1 and fit them to my 308ci, decked the block 80thou, had to dish the pistons so the crowns were so thin they were destined to disintegrate. Of course this engine was Supercharged with a 174B&M blower runnign 13psi. The engine lasted 2 weeks before the water jackets started spraying in the intake ports as they ground through when they were porting and then thought it was a good idea to solder a little brass shim over the holes so I could drive off the driveway and lose warranty.

But you live and learn
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Old 23-01-13, 17:21   #8
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cometic or hks headgasket , or just leave it compression n boost doesnt kill a engine , heat does thou , u will lift ya head b4 it blows
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Old 23-01-13, 18:21   #9
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Abit of info here ---> http://www.calaisturbo.com.au/showthread.php?t=59018
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Old 23-01-13, 19:37   #10
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Mate just leave it hi comp, the barra (ford ba ect)engines run 9.5:1 and they take **** loads
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Old 23-01-13, 20:17   #11
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Appreciate all the idea's, info and help guys.

Will let you know how I go.

Cheers,

Steve
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Old 23-01-13, 21:46   #12
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Mate just leave it hi comp, the barra (ford ba ect)engines run 9.5:1 and they take **** loads

Yeh..but cylinder head design is a major factor.....haha, no stinky 2 valver

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Old 23-01-13, 22:30   #13
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Mate just leave it hi comp, the barra (ford ba ect)engines run 9.5:1 and they take **** loads

The BA's run 8.7:1 in the XR6T and 9.7:1 in the XR6.

The BF's run 8.7:1 in T's and 10.3 in the nonT's
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Old 23-01-13, 23:15   #14
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how can you compare a newish dphc fprd 4l to a 25ish year old sohc nissan 3l lol
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Old 24-01-13, 11:02   #15
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plenty of people on here run high comp motors, I suppose it depends on how much boost you wanna have, I wouldn't be boosting more than 8psi into a high comp donk.
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Old 24-01-13, 11:37   #16
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20psi, they love it.

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plenty of people on here run high comp motors, I suppose it depends on how much boost you wanna have, I wouldn't be boosting more than 8psi into a high comp donk.
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Old 24-01-13, 12:27   #17
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Will probably run 10psi, with quite a thick head gasket on so it should be alright.
As said, I've heard a lot of people have run them on a lot higher for long periods of time. Probably just a hit n miss really. We will see how it pulls through then.
12psi max haha
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Old 24-01-13, 12:31   #18
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20psi, they love it.
Yes, yes they do lol
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Old 24-01-13, 12:42   #19
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Don't even bother mate, just leave it as is and make sure the fuel system, ECU and tune are up to scratch.

I would do that on a factory ECU, with turbo injectors.

Keep 98 Octane up to it, put it on a dyno and make sure its not havign a rattle at stock timing and go from there.

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Will probably run 10psi, with quite a thick head gasket on so it should be alright.
As said, I've heard a lot of people have run them on a lot higher for long periods of time. Probably just a hit n miss really. We will see how it pulls through then.
12psi max haha
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Old 24-01-13, 13:49   #20
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Put a thicker gasket on.

Port the compression rings with a sand ingestion through the intake. Rev car in park/neutral to the limiter and throw handfuls of sand at the throttlebody.
do not listen to this guy, this will only give your head a port and polish, to lower compression you need to run 91 octane and run about 13psi of boost should lower compression to about 60psi
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Old 24-01-13, 14:19   #21
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lol **** face
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Old 25-01-13, 00:21   #22
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Lmfao u guys that think hi comp 3lt don't last or dont work seriously regardless of 2 valve or 4 valve ect 25 year old engine or modern they work and that's all there is to it....mate do a search its been covered a million times there's no need to lower the compression unless ya going to get serious with ya setups
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Old 25-01-13, 19:29   #23
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If your worried about it just buy a knock sensor.
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Old 25-01-13, 20:31   #24
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Put a thicker gasket on.

Port the compression rings with a sand ingestion through the intake. Rev car in park/neutral to the limiter and throw handfuls of sand at the throttlebody.
JIFF down the cylinders works wonders also
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Old 25-01-13, 23:47   #25
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JIFF down the cylinders works wonders also
I prefer colgate, i hear thats how some of the quickest VLT's are ported
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