22RTE Oversized pistons
05-28-2009, 08:05 PM
#1
Registered User
Thread Starter
Join Date: May 2009
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
22RTE Oversized pistons
So im a newb on this site and have some questions and figured everyone on this site would have some good answers. I've tried searching the web and this site but i haven't been able to get any. 
Im currently rebuilding my 86 22rte, my block is at a machinist's house and so after him measuring everything he told me that i should look for another block because it is already bored .20 over and that Toyota doesn't recommend anything past .30 im gonna start having overheating problems. Is this true? I wanted to just get it bored .40 over because he says that .30 wont be enough to clean up the cylinders. Will .40 be fine?
I was looking into getting some Weisco pistons and using my stock rods n crank (getting the crank turned and micro polished), and having the rotating assembly balanced. What do you guys think about that? Any info is much appreciated.
Thank You,
Andy
Im currently rebuilding my 86 22rte, my block is at a machinist's house and so after him measuring everything he told me that i should look for another block because it is already bored .20 over and that Toyota doesn't recommend anything past .30 im gonna start having overheating problems. Is this true? I wanted to just get it bored .40 over because he says that .30 wont be enough to clean up the cylinders. Will .40 be fine?
I was looking into getting some Weisco pistons and using my stock rods n crank (getting the crank turned and micro polished), and having the rotating assembly balanced. What do you guys think about that? Any info is much appreciated.
Thank You,
Andy
05-28-2009, 08:13 PM
#2
Registered User
Join Date: Mar 2008
Location: Temecula Valley, CA
Posts: 12,723
Likes: 0
Received 4 Likes
on
4 Posts
No, not true.
If the stock cooling system can deal with people pushing 15+ PSI boost from a 22RTE, it can deal with stock boost and .040 over. The biggest problem would come from making sure the compression ratio isn't adversely affected by the overbore and larger pistons, which if not dealt with could lead to detonation (but not likely since stock internals will handle 15+ PSI boost).
Now the machinist may be accurate in saying .030 isn't enough and .040 is what you need but to suggest that installing proper oversized pistons will over tax the cooling system suggests he's not all that familiar with these engines.
Personally, I think you'll be fine.
If the stock cooling system can deal with people pushing 15+ PSI boost from a 22RTE, it can deal with stock boost and .040 over. The biggest problem would come from making sure the compression ratio isn't adversely affected by the overbore and larger pistons, which if not dealt with could lead to detonation (but not likely since stock internals will handle 15+ PSI boost).
Now the machinist may be accurate in saying .030 isn't enough and .040 is what you need but to suggest that installing proper oversized pistons will over tax the cooling system suggests he's not all that familiar with these engines.
Personally, I think you'll be fine.
05-28-2009, 10:00 PM
#3
Contributing Member
why would lager pistons cause... 
nevermind... 
agreed with Abe; I'd be more concerned about PSI problems from the change in the combustion chamber volume more than I would overheating
nevermind... agreed with Abe; I'd be more concerned about PSI problems from the change in the combustion chamber volume more than I would overheating
06-08-2009, 06:17 PM
#5
Registered User
Thread Starter
Join Date: May 2009
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Nice!!! that is all good news....any one know where i can order some .040 over forged pistons that aren't $500-$600. i thought i saw some wiseco's .040 over online for under $400 somewhere, but can seem to find it. im goin to try calling toysport tomorrow but all suggestions are appreciated.
06-08-2009, 07:06 PM
#6
Registered User
Join Date: Mar 2008
Location: Temecula Valley, CA
Posts: 12,723
Likes: 0
Received 4 Likes
on
4 Posts
A bigger diameter cylinder means room for more air/fuel. If the piston crown isn't altered appropriately, having more air/fuel means a higher compression ratio. Although it's not a huge change in cylinder volume, with a turbocharger pumping in 40-50% more air/fuel the change in volume will affect the compression ratio under boost.
If you can relate to using a larger diameter bore master cylinder on the brake system means more brake fluid is moved when you press the pedal, you might be able to picture what I mean.
Any reputable toyota parts supplier should be able to get something. You might try contacting engnbldr.com or even LCE[/URL] to get prices and info
If you can relate to using a larger diameter bore master cylinder on the brake system means more brake fluid is moved when you press the pedal, you might be able to picture what I mean.
Nice!!! that is all good news....any one know where i can order some .040 over forged pistons that aren't $500-$600. i thought i saw some wiseco's .040 over online for under $400 somewhere, but can seem to find it. im goin to try calling toysport tomorrow but all suggestions are appreciated.
06-08-2009, 07:19 PM
#7
Contributing Member
A bigger diameter cylinder means room for more air/fuel. If the piston crown isn't altered appropriately, having more air/fuel means a higher compression ratio. Although it's not a huge change in cylinder volume, with a turbocharger pumping in 40-50% more air/fuel the change in volume will affect the compression ratio under boost.
If you can relate to using a larger diameter bore master cylinder on the brake system means more brake fluid is moved when you press the pedal, you might be able to picture what I mean.
If you can relate to using a larger diameter bore master cylinder on the brake system means more brake fluid is moved when you press the pedal, you might be able to picture what I mean.
but what does that have to do with overheating?
that's what threw me off...
Trending Topics
06-08-2009, 07:23 PM
#8
Registered User
Join Date: Mar 2008
Location: Temecula Valley, CA
Posts: 12,723
Likes: 0
Received 4 Likes
on
4 Posts
06-08-2009, 07:44 PM
#9
Contributing Member
06-08-2009, 08:10 PM
#11
Registered User
Join Date: Mar 2008
Location: Temecula Valley, CA
Posts: 12,723
Likes: 0
Received 4 Likes
on
4 Posts
Thinner cylinder walls will tend to run hotter. Hot metal expands, and possibly warps if it has no particular direction to expand in. Warped cylinder walls create a situation where the rings have to compress and expand during each stroke in order to maintain the compression and oil sealing. If the cooling system is designed properly, it will scrub heat away from the walls sufficiently well to keep that warpage from happening but if it can't you end up with a situation where the rings cannot seal the cylinder / piston properly and possibly have the piston itself contact the cylinder wall.
06-08-2009, 08:19 PM
#12
Registered User
Thread Starter
Join Date: May 2009
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Thinner cylinder walls will tend to run hotter. Hot metal expands, and possibly warps if it has no particular direction to expand in. Warped cylinder walls create a situation where the rings have to compress and expand during each stroke in order to maintain the compression and oil sealing. If the cooling system is designed properly, it will scrub heat away from the walls sufficiently well to keep that warpage from happening but if it can't you end up with a situation where the rings cannot seal the cylinder / piston properly and possibly have the piston itself contact the cylinder wall.
i emailed engnbldr for some pistons.....anyone use his pistons on 22RTE?? are they oem quality or better??
06-09-2009, 06:29 AM
#13
*Anyway, thinner cylinder walls do heat up a tad more. The reason isn't all compression, it's mostly friction.
Cylinder walls pant like a Dog when the engine is running, they actually expand and contract with each cycle. This increases drag which is heat.
Normally not really a concern with any usual overbore up to around 1.00mm (.040") but in rare cases like an old 427 Ford that was thin to start with then boring becomes a problem. The Yota cooling system handles it easily.
Plenty of meat on the 22R designs, I have had production runs set up and bored 5-6 per day to .040" over and no problems with temps. So if .040" over was going to be a prob then I would have one heck of a lot of folks mad at me.....*EB
06-09-2009, 09:20 AM
#14
Registered User
>>>*Well, here I sit at my Warren place with honest to gosh HI-Speed! We are remote at the other place and all we can get is dialup, (or wireless which only works when the Sun shines.)...tough to get some sites open on dialup..
*Anyway, thinner cylinder walls do heat up a tad more. The reason isn't all compression, it's mostly friction.
Cylinder walls pant like a Dog when the engine is running, they actually expand and contract with each cycle. This increases drag which is heat.
Normally not really a concern with any usual overbore up to around 1.00mm (.040") but in rare cases like an old 427 Ford that was thin to start with then boring becomes a problem. The Yota cooling system handles it easily.
Plenty of meat on the 22R designs, I have had production runs set up and bored 5-6 per day to .040" over and no problems with temps. So if .040" over was going to be a prob then I would have one heck of a lot of folks mad at me.....*EB
*Anyway, thinner cylinder walls do heat up a tad more. The reason isn't all compression, it's mostly friction.
Cylinder walls pant like a Dog when the engine is running, they actually expand and contract with each cycle. This increases drag which is heat.
Normally not really a concern with any usual overbore up to around 1.00mm (.040") but in rare cases like an old 427 Ford that was thin to start with then boring becomes a problem. The Yota cooling system handles it easily.
Plenty of meat on the 22R designs, I have had production runs set up and bored 5-6 per day to .040" over and no problems with temps. So if .040" over was going to be a prob then I would have one heck of a lot of folks mad at me.....*EB
Thread
Thread Starter
Forum
Replies
Last Post
charlie_fong
General Vehicle Related Topics (Non Year Related)
0
09-27-2015 10:06 PM
