Author Topic: 20R vs. 22R Blocks (Read 20082 times)

AR80Toy · « **on:** Jul 30, 2007, 10:55:29 AM »

Just wondering what the differences are between the 20R and 22R Blocks and if one is better than the other ?

79coyotefrg · « **Reply #1 on:** Jul 30, 2007, 12:16:38 PM »

havent i discussed this enough times

the ONLY difference between a 20R and the early 22R is the diameter of the pistons ie. bore

20R=88.5mm
22R=92mm
everything else including even the piston wrist pins are identical

AR80Toy · « **Reply #2 on:** Jul 30, 2007, 12:36:22 PM »

Good lord , sorry for asking

79coyotefrg · « **Reply #3 on:** Jul 30, 2007, 12:57:41 PM »

AR80Toy · « **Reply #4 on:** Jul 30, 2007, 01:20:13 PM »

Thats it Glen , I'm

Momma !!!!!!!

YotaJosh · « **Reply #5 on:** Jul 30, 2007, 02:12:18 PM »

Quote from: AR81Toy on Jul 30, 2007, 01:20:13 PM

Thats it Glen , I'm Momma !!!!!!!

You're in trouble now Glen.

jimbo74 · « **Reply #6 on:** Jul 30, 2007, 02:28:18 PM »

22re is better.....

personally, i like the 22r second gen engines better

79coyotefrg · « **Reply #7 on:** Jul 30, 2007, 04:12:14 PM »

Quote from: jimbo74 on Jul 30, 2007, 02:28:18 PM

22re is better.....

personally, i like the 22r second gen engines better

THK Matt · « **Reply #8 on:** Aug 01, 2007, 03:38:18 PM »

the head on a 20R flows better and performs better then the head on a 22R series motor....

79coyotefrg · « **Reply #9 on:** Aug 01, 2007, 04:23:06 PM »

Quote from: ToyRider.87 on Aug 01, 2007, 03:38:18 PM

the head on a 20R flows better and performs better then the head on a 22R series motor....

we're discussing blocks not heads

THK Matt · « **Reply #10 on:** Aug 01, 2007, 04:31:15 PM »

i knew that.

if the only difference is in piston size.... then why is the 22R series considered the best engine?
im curious.

becauce people use the 22R block, 20R head... if they are both the same..... could you just use the 20R blo9ck... bore it out and use the 20R head..... voila.... no need to find a 22R block.

79coyotefrg · « **Reply #11 on:** Aug 01, 2007, 04:36:54 PM »

actually YES your right on the dot, Toysport was the first back in the early 80's to take a 20R block and bore it to 92mm

making a 20R 2400cc motor, with dual sidedrafts i believe they put out around 180 hp www.toysport.com

79coyotefrg · « **Reply #12 on:** Aug 01, 2007, 04:43:15 PM »

the REAL deal in building a bad little "R" motor is take everything from a 20R and mount it on the 22R block

22R valves in a 20R head with 22R rockers on the 20R rocker shafts,
20R timing kit everything
a weber carb and a 450 lift cam can find you in the 150-160 hp area
dual sidedrafts and a wild cam and your making 180-200, yea its expensive for those "wild" parts but its pretty damn cool when the guy next to you at that last redlight pulls in beside you and swears your running a v8

RN37DD · « **Reply #13 on:** Aug 02, 2007, 05:21:29 AM »

the best part is when you get the drop on them in a beat up old gen 1 and they have to give it everything they got to catch you in their expensive new rig..

Gittinit · « **Reply #14 on:** Aug 02, 2007, 06:45:56 AM »

22R rockers on the 20R rocker shafts

couldn't I just use the whole 22r rocker assembly? I have both a 20r, and a 22r talldeck block already, both may need bored. Which one should I use, and why?

I want a high compression motor to run propane, no street racing here, just some off the line torque please.

RN37DD · « **Reply #15 on:** Aug 02, 2007, 08:29:50 AM »

I'm sure you can. on these old engines it's hard to tell what's what. i used the lighter 22r rockers on 79 20r stands and shafts only because the 22r stand screws were wimpy looking and stripped. other than that everything measured out the same. i don't know if you'll get any extra low end with a 20r head but having an extra 1000rpm's of power is a big advantage even in dirt. don't have to shift on a uphill to get it over the top and worry about missing a shift in some deep mud.

79coyotefrg · « **Reply #16 on:** Aug 02, 2007, 08:42:35 AM »

i was using the .460 LC cam so i took extra time and measured oil holes and stuff on the different shafts, i think i remember the 20R shafts and 22R rockers having a slightly better oiling of the cam lobe, on my cam, if you have a stock ca not sure it would be a difference

BUT its possible the 20R rocker shafts i had had been modified at some point

twistedtoy92 · « **Reply #17 on:** Aug 02, 2007, 09:15:15 AM »

man i need to do this stuff to my 84, its got an almost too tired 20r and i got a complete 22r motor with it when i bougt it soo i wanted to put the 20r head on the 22r block... but how much can you bore a 22r out? 0.60?

RN37DD · « **Reply #18 on:** Aug 02, 2007, 09:53:33 AM »

top 22r rockers... bottom 20r rockers.. 22r rockers lighter with wider harder cam pads.. 1 went .020 over and compression is about 180psi...

79coyotefrg · « **Reply #19 on:** Aug 02, 2007, 10:13:23 AM »

Quote from: twistedtoy92 on Aug 02, 2007, 09:15:15 AM

man i need to do this stuff to my 84, its got an almost too tired 20r and i got a complete 22r motor with it when i bougt it soo i wanted to put the 20r head on the 22r block... but how much can you bore a 22r out? 0.60?

cant go over .040 if you want to use a 20R head in fact i would say not over .030 otherwise your really cutting into your head gasket surface area

THK Matt · « **Reply #20 on:** Aug 02, 2007, 10:39:15 AM »

thats awesome!
future motor for me.

Fearofrunner · « **Reply #21 on:** Aug 02, 2007, 12:41:42 PM »

now is it true that the 84 22r has a different head and the 20r can't bolt to it?? I heard that in 84 for some reason that the motor was a different breed from the others.

I know you can't take an EFI head and put it on an 84 block.

THK Matt · « **Reply #22 on:** Aug 02, 2007, 01:14:46 PM »

Quote from: Fearofrunner on Aug 02, 2007, 12:41:42 PM

now is it true that the 84 22r has a different head and the 20r can't bolt to it?? I heard that in 84 for some reason that the motor was a different breed from the others.

I know you can't take an EFI head and put it on an 84 block.

something to that affect.... ive heard something like this too.

RN37DD · « **Reply #23 on:** Aug 02, 2007, 02:04:48 PM »

the block i used was a 83 or 84 because it came with the single chain.. don't know all the history.. the 20r head well bolt on to the 81-84 block.. it's just like the 20r block only a bigger bore.. they changed the block in 85..then it's pretty much the same until 95 i believe. thats the years efi was used with.. a few did have carburetors.like my 86. if I'm wrong let me know..

AR80Toy [OP]

AR80Toy [OP]

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