84 yota ex-cab

I am about to rebuild my 22re. I was curious if any one has bumped up there compression at all. If so, how high is safe and did you do head work or high compression pistons?

Itoyota

When I did my engine work, it went through several stages.
The eventual end setup that I was satisfied with pressed my ctllinders to slightly higher than peak stock compression at 185-195psi. If I am not mistaken 180psi is brand new condition compression on these motors. Getting back to that compression rating was difficult after I had my cyllinders overbored and larger pistons put in. I don't have high compression DOMED pistons, if that's what you were referring to.
I had the head machined multiple times until I was able to achieve the current compression to cyllinder volume ratio.

Good luck with your rebuild.

corax

my last 22re build (which ran like a raped ape) went something like this: 22RE from an '84 2wd (so I could use the double row timing chain with the factory chain cover) - P&P head / intake - 10.5:1 forged alum Wiseco pistons - cylinders bored .080" over - balanced & blueprinted - Crane Mild Cam - cylinder head & block deck machined - adjustable oil pressure relief - smoothed and polished connecting rods

- with the forged alum pistons I had to relocate the knock sensor ~2" lower on the block (forged alum run different cylinder clearances and the knock sensor was picking up "noise" from them, 2" lower and it stopped retarding the ignition) - Hyperurtectic (sp?) would be a better choice if I had it to do again
- even with the higher compression, I only ran 89 octane with no pinging - though I could also run 87 if I needed to

you should be able to go to higher compression pistons with no issues, these engines are so detuned and over-engineered . . .

dcg9381

I had a "whoops" in my last engine design, resulting in 9.4:1 compression. I was able to do 7psi of boost on it, with 93 pump gas - without major issues.

Personally, I wouldn't take a street motor past 10:1 with the 22RE head design. It's not a Corvette or a Honda - the ignition system is a little sloppy and the head design is around 30 years old.

Talk to engnbldr about it... And don't cut too much off your head without checking cam timing.

84 yota ex-cab

(corax) what company makes a P&P head? Is it p&p or someone else? Do they have a website that i could check out?

84sr5yoty

It seems that the later 22re's pinged straight off the lot when they were new, so personally, I wouldn't bump up the compression at all unless you like paying more $$ at the pump for higher octane.

corax

P&P = port and polish

I did my own work using a Dremel with the flex shaft and some sanding drums / mini flap wheels. You may want to check out LC Engineering, although there are many "speed shops" that can take the head off your engine or a spare you may have and increase the flow a bit. Just remember that bigger isn't necesarily better when it comes to intake and exhaust port size, you need intake velocity.

84 yota ex-cab

how much more compression would i get if i were to shave 20 thousands off the head?

dcg9381

That's going to depend on your head volume, your displacement - mainly bore as you're not changing stroke, which HG you're using, etc.