I'm trying to lower compression in my engine - Page 3 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

JD001 · 05-02-2016, 12:38 PM

Actually I have a question, why do you want to reduce engine compression?

Another good reliable method to help reduce engine compression:
1. Take out say 2 spark plugs
2. Poke thin screw driver into the engine
3. Carefully locate piston crown and then hit screw driver with hammer to hole the piston crown
4. Re insert spark plug
5. You may need to change the oil so that piston head bits don't wreck the engine

ScoobsMcGee · 05-02-2016, 12:44 PM

At first I was worried that someone would read this and take it seriously. Now I'm to the point where if they do, they deserve whatever they get. Including salmonella poisoning.

86kahl · 05-02-2016, 12:45 PM

Quote:

Originally Posted by JD001

Actually I have a question, why do you want to reduce the engine compression?

Another good reliable method to help reduce engine compression:
1. Take out say 2 spark plugs
2. Poke thin screw driver into the engine
3. Carefully locate piston crown and then hit screw driver with hammer to hole the piston crown
4. Re insert spark plug
5. You may need to change the oil so that piston head bits don't wreck the engine

Cuz I don't have money for a 2jz swap but low compression is life.

Bro stop trolling, everyone knows a screwdriver won't fit cuz boxer.

MisterSheep · 05-02-2016, 12:46 PM

Quote:

Originally Posted by 86kahl

Cuz I don't have money for a 2jz swap but low compression is life.

Bro stop trolling, everyone knows a screwdriver won't fit cuz boxer.

Ever tried one of those bent screw drivers?

HunterGreene · 05-02-2016, 01:03 PM

Quote:

Originally Posted by MisterSheep

Ever tried one of those bent screw drivers?

left handed or right handed?

KR-S · 05-02-2016, 03:48 PM

Have you tried putting 87 octane in your car? I put 86 octane and the engine lets me know it lowered its compression.

Since then, I've always run 86 octane, but 87 should work just as well.

kevman_101 · 05-02-2016, 04:14 PM

Your going about all wrong. Loosening the plugs is very inconsistent. Here's the secret to do it like the pros. Get a drill bit set and drill a hole through the head. Now be careful not to use a big bit at first or you might go too low compression like a scrub. Start small and go bigger to get that perfect compression. Also don't worry if ya hit a valve, they are actually just to add weight to the engine.

Tectoniic · 05-02-2016, 04:28 PM

Quote:

Originally Posted by HunterGreene

left handed or right handed?

I will never forget the time I was playing baseball with some friends and the one kid picks up a bat and was completely serious when he asked if it was a left handed or right handed bat

Tcoat · 05-02-2016, 04:28 PM

Quote:

Originally Posted by KR-S 86

Have you tried putting 87 octane in your car? I put 86 octane and the engine lets me know it lowered its compression.

Since then, I've always run 86 octane, but 87 should work just as well.

I have looked everywhere for octane reducer but can't seem to find any. Do you have it local there?

KR-S · 05-02-2016, 04:58 PM

Quote:

Originally Posted by Tcoat

I have looked everywhere for octane reducer but can't seem to find any. Do you have it local there?

Never bothered to look as 86 octane was already readily available to me, but we should have some here.

fumanchu1 · 05-02-2016, 05:28 PM

Quote:

Originally Posted by Tcoat

I have looked everywhere for octane reducer but can't seem to find any. Do you have it local there?

Pro tip, just add sugar and flour to the gas tank, it'll reduce octane plus it smells like cake

Tectoniic · 05-02-2016, 07:00 PM

OP forgot the ultimate compression lowering trick. I removed my engine to bring the car down to a zero compression rating. I can now safely run infinite boost.

Checkmate high compression lovers

86kahl · 05-02-2016, 07:14 PM

Quote:

Originally Posted by Tectoniic

OP forgot the ultimate compression lowering trick. I removed my engine to bring the car down to a zero compression rating. I can now safely run infinite boost.

Checkmate high compression lovers

This. Thanks for your suggestions (some of you) but I've decided to ultimately swap in an SR20det. It's half the cost of a 2jz or LSx, 20 years old and pull a premium a week before race wars.

Tcoat · 05-02-2016, 07:32 PM

Quote:

Originally Posted by Tectoniic

OP forgot the ultimate compression lowering trick. I removed my engine to bring the car down to a zero compression rating. I can now safely run infinite boost.

Checkmate high compression lovers

Zero compression!

05-02-2016, 07:00 PM	#40
Tectoniic #FiftyShadesOfBlue Join Date: Apr 2015 Drives: 2015 FR-S Location: Chicago Posts: 1,195 Thanks: 2,086 Thanked 1,425 Times in 730 Posts Mentioned: 13 Post(s) Tagged: 4 Thread(s)	OP forgot the ultimate compression lowering trick. I removed my engine to bring the car down to a zero compression rating. I can now safely run infinite boost. Checkmate high compression lovers __________________ Engine/Exhaust: OFT w/ E85 Tune \| FT86SF Catted UEL \| Invidia Q300 Catback Wheels/Tires/Suspension: Avid.1 AV-20 18x8.5 +33 w/ 245/35/18 PSS \| RCE Yellow Springs \| Velox LCAs Cosmetic: Valenti FT86SF Special Edition Tails \| Diode Dynamics Full HID/LEDs \| BRZ Fender Garnishes

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
HKS Stroker Kit or Lower Compression Setup?	Efferalgan	Engine, Exhaust, Transmission	4	05-02-2016 04:58 AM
Low compression?	Venator	Engine, Exhaust, Transmission	4	06-17-2014 11:37 AM
Lower Compression with Headgasket	Team STILLEN	Engine, Exhaust, Transmission	28	12-15-2013 06:26 PM
Low Compression - 10:1 // 9:1	1086	Engine, Exhaust, Transmission	12	12-13-2013 06:46 PM
High compression engine fuel requirements	Ben_G	Engine, Exhaust, Transmission	3	01-16-2013 12:44 PM

05-02-2016, 12:38 PM	#29
JD001 Senior Member Join Date: Apr 2015 Drives: Subaru BRZ Location: UK Posts: 6,255 Thanks: 7,975 Thanked 6,494 Times in 3,635 Posts Mentioned: 26 Post(s) Tagged: 2 Thread(s)	Actually I have a question, why do you want to reduce engine compression? Another good reliable method to help reduce engine compression: 1. Take out say 2 spark plugs 2. Poke thin screw driver into the engine 3. Carefully locate piston crown and then hit screw driver with hammer to hole the piston crown 4. Re insert spark plug 5. You may need to change the oil so that piston head bits don't wreck the engine

05-02-2016, 12:44 PM	#30
ScoobsMcGee Junior Senior with Cheese Join Date: Aug 2014 Drives: 15 BRZ Location: York, PA Posts: 3,006 Thanks: 6,837 Thanked 7,049 Times in 2,345 Posts Mentioned: 13 Post(s) Tagged: 2 Thread(s)	At first I was worried that someone would read this and take it seriously. Now I'm to the point where if they do, they deserve whatever they get. Including salmonella poisoning.

05-02-2016, 03:48 PM	#34
KR-S Sporadic Member Join Date: Nov 2015 Drives: 2016 Halo FR-S M/T Location: Earth Posts: 3,145 Thanks: 5,221 Thanked 3,552 Times in 1,746 Posts Mentioned: 50 Post(s) Tagged: 33 Thread(s)	Have you tried putting 87 octane in your car? I put 86 octane and the engine lets me know it lowered its compression. Since then, I've always run 86 octane, but 87 should work just as well.

05-02-2016, 04:14 PM	#35
kevman_101 Senior Member Join Date: Apr 2013 Drives: 2013 Scion FRS Location: Bathurst New-Brunswick Posts: 222 Thanks: 3 Thanked 101 Times in 61 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Your going about all wrong. Loosening the plugs is very inconsistent. Here's the secret to do it like the pros. Get a drill bit set and drill a hole through the head. Now be careful not to use a big bit at first or you might go too low compression like a scrub. Start small and go bigger to get that perfect compression. Also don't worry if ya hit a valve, they are actually just to add weight to the engine.

User Name		Remember Me?
Password