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Registered:
April 2003
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20R, 21R and 22R
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Fri, 30 July 2004 11:22
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ok here's the question. i have managed to find a rare 20R head at a wreckers and i'm going to do the 20R head onto a 22RE block conversion, but i was camparing my 20R head to a 21R head and they seem to look the same. The only differance i can c is that the 21R had square intake ports. This would be good so that i can run the 22RE intake manifold but i'm curiouse why poeple don't just use the 21R head instead of a 20R as they are fairly rare in australia. From the information i have gathered from the net the 21R flows as well as the 20R but i don't know how accurate this is.
thanks for all your help guys
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Location:
Brisbane
Registered:
May 2002
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Re: 20R, 21R and 22R
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Fri, 30 July 2004 11:33
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From what I've gathered, the 20R/22R hybrid engine is only popular in the US where they have limited access to good stuff like the 18R-G and 1G-GTE. The 21R was never available there which is probably why you've never heard of a 21R/22R combo. If you think the 21R head will work better than the 20R, go for it and let us know how it works out!
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Registered:
April 2003
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Re: 20R, 21R and 22R
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Fri, 30 July 2004 11:52
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cheers for that. anyone else got any more info i should know. can never be to informed.
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Location:
Melbourne
Registered:
March 2003
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Location:
Hobart, Tas
Registered:
May 2002
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Re: 20R, 21R and 22R
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Sat, 31 July 2004 09:29
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You need to use an EARLY 21r, which has round ports. I wasn't even sure that we ever got it in Aus - most seem to be the ones with the square ports, which I belive is the equiv of a US 22R head.
Also... to use the 20R head on an Aus 22Re, you have to have it milled a fair bit because the 22RE we got in '85 was the latter 22R [square rocker cover front instead of sloped back, slightly higher comp, a few other differences] which has a different head anyway.
As the 2xR gurus on the Old Celica club www.celicas.org
BTW The 21R was available there AFAIK, just not as popular
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Location:
brisbane
Registered:
March 2004
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Re: 20R, 21R and 22R
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Sat, 31 July 2004 12:24
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stefan is spot on 
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Location:
VIC, Sth Frankston.
Registered:
July 2003
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Re: 20R, 21R and 22R
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Sun, 01 August 2004 09:17
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Stefan, are you 100% sure about the early 21R? I thought the early 21R wouldve been like the early 22R, square intake ports, round exhaust ports, sloped rocker cover, no holes for the efi intake manifold.
The difference with the 20R head is that the intake ports dont swirl like the 21/22R. Although, the 20R has smaller valves. Apparently there is an increase in compression, but how big a difference it makes, is not that big a deal.
If you were to put the 20R head on the 21R-C we got in australia, then you would have a decent combo, as the 21R-C has the open combustion chambers w/domed pistons. Where as with the aus 22RE, its the later style as Stefan said, has closed combustion chamber, flat top pistons, efi intake manifold wont bolt up with very serious modification.
If you want to see something cool, check out the 20R with twin turbos and massive freakin plenum chamber.http://66.223.106.32/celicaforums/index.php?showto pic=2391
Cheers,
James
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Registered:
April 2003
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Re: 20R, 21R and 22R
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Sun, 01 August 2004 10:38
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You can get great comp (10:1) with the use of the 20R head on the 22RE block and by using pre 85 22RE pistons ( Dometop ).
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