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Old 06-21-2010, 10:59 AM   #1 (permalink)
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20r/22r hybrid questions

im thinking of doing the 20r/22r hybrid..... so a few questions

#1 where is the best place to find a 20r pickup head?

#2 is it really worth porting the head and upsizing the valves? or is it just stupid to put the time and money into it without doing it?

#3 is it best to change to a higher compression piston (flattop or so on)?

#4 camshaft, leave it stock and go to a rockcrawler cam or a 280 ISKY?

#5 fuel pump upgrade, what part number for a low pressure high flow pump and from where?

#6 what header is best, i know it should be a 2.75" collector and 2.75 exhaust.



And what else should i take into consideration?
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Old 06-21-2010, 01:02 PM   #2 (permalink)
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IMO if you are putting a 20r head on it's for high rpm horsepower. Mine still has plenty of torque low down but I put an engnbldr 270/430 cam in mine and it pulls well into the high rpms.

I have no idea on valves and porting.. I ported mine but kept the stock valves and it worked out fine. I don't know how much better it would be with the bigger valves. Again though, big valves are for high rpm operation.

Higher CR would probably require higher octane gas..

I dunno what header is really best.

When you're doing this you have to consider what you want.. the 20r head flows really well but that's only really useful above 4000rpm or so where the 22r/re heads stop flowing well. So I think it's only worth doing the swap if you want more power at higher rpm.
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Old 06-21-2010, 03:29 PM   #3 (permalink)
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This site has some good info for you to review.

http://www.toysport.com/technical%20...tech_notes.htm
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Old 06-22-2010, 05:01 AM   #4 (permalink)
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thanks for the info
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Old 05-02-2012, 10:01 PM   #5 (permalink)
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This is awesome information! Dont let this one die.
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Old 05-03-2012, 01:49 PM   #6 (permalink)
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I am in the process of building a hybrid myself. Look on the old celica forums Best info you can get.http://www.classic-celica.com/modules.php?name=Forums
From What i under stand of this 20/22r set up is there is a slight Compression gain when doing the head swap. A lot of people on the celica forums Do the head swap because the 20 head and intake manifold flow better than the 22r's.

Porting: well help a lot so will bigger valves. As stated above the set up like rpms. So doing the p&p and valves will help.

Pistons you could change to high comp pistons or you could shave the head. but shaving the head could require a adj cam gear.

Cam: depending on if you have the head shaved or not will choosing a cam will depend on how much you have taken off. I will be running a EB 270 cam. But the best way to know if the cam you pick will work is to clam test the engine.
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