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holley 4 bbl carbs and offinhauser intake on a 20r #970747 11/05/09 02:33 AM
Joined: Nov 2009
Posts: 13
drhula Offline OP
Need a Spot
i have an 85 yota with the 20 r in it. someone before me put on a holley 390 cfm 4160 series carb and offinhauser intake. i called summit and well its a $600 setup. i have the 4 spd trans but ... well the truck still has the same power nothing more maybe even less is there something i am missing here or is it just me.... you just dont put a 4 bbl on a 4 cylinder? has anyone else done this ? or should i trade off the setup for a weber and stock intake? any ideas,input.

holley or not to holley
single choice
Votes accepted starting: 11/05/09 01:33 AM
From the Off-Road World
Re: holley 4 bbl carbs and offinhauser intake on a 20r [Re: drhula] #970748 11/05/09 06:41 AM
Joined: Apr 2005
Posts: 525
yodta Offline
Rock Warrior
I was getting ready to say no Holley unless that engine and head have had some extensive work done. then I went looking for a link with info about the flow capabilities of carbs, thinking to suggest the Weber 32/36 DGEV or the 38/38 DGES -- turns out the DGES can flow 390CFM, as well, though I'm not sure how many folks run those on the 20R engine; many in operation on the 22R though.

http://www.off-road.com/trucks4x4/article/articleDetail.jsp?id=274605

it's my understanding that high flow carbs still work, but I think the idea is that they take some engine speed to wake up, and that the smaller carbs tend to offer better low to mid range throttle response due to the velocity of the mix.

after some quick reading on that Holley carb, it seems that it's a progressive carb with vacuum secondaries? that's a good thing. progressive carbs make for good driveability, but may not flow as much as synchronous models. most people tend to think bigger is better, but not with induction if your engine's not built to move the air and fuel.

is this the Dual Plane Offy intake? if so, the intake and carb are probably a pretty good combination! I say leave it on, and learn as much as you can about getting it tuned properly. post up some info and photos and let's see if we can get it dialed in for you!

Last edited by yodta; 11/05/09 06:56 AM.

msg - '87 xtracab
Re: holley 4 bbl carbs and offinhauser intake on a 20r [Re: yodta] #970749 11/06/09 03:28 AM
Joined: Mar 2005
Posts: 37
1stgenboy Offline
Getting the Wheeling Fever
'85 Yota with a 20R? somebody down grade the motor at some point? Is the motor worn? I have found that these motors don't seem to lose compression as they wear, but the came chain stretches making cam timing late and this makes them sluggish.

Re: holley 4 bbl carbs and offinhauser intake on a 20r [Re: 1stgenboy] #970750 11/06/09 03:48 AM
Joined: Oct 2002
Posts: 15,887
kewlynx Offline
Toyota & Classifieds Moderator
*****
Could be a 20/22R hybrid mill too. They're out there.


http://www.walkablecommunities.org/

Democracy is two wolves and a lamb voting on what to have for dinner. Liberty is a well-armed lamb contesting the vote.

**ubi apis- ibi salus**
Re: holley 4 bbl carbs and offinhauser intake on a 20r [Re: kewlynx] #970751 11/06/09 04:37 AM
Joined: Nov 2009
Posts: 13
drhula Offline OP
Need a Spot
i have never heard of toyota doing a hybrid engine but if ford chevy and dodge can why not a yota from what i am seeing on this engine the compression is good no oil burn looks like the head has been rebuilt and ported polished and so on and much bigger exhaust it should have a bunch more power where could i find the block number and the head number on it it may have a 20 r head on a 22re block i am also going to do a vin search on it to see if the 22re tag on the side of the truck is even correct there are a few unknowns with it as for the card i need to do more research on it to see if it is setup correctly for this application a vortec V6 is starting to look good at this point but i love the yota engines

Re: holley 4 bbl carbs and offinhauser intake on a 20r [Re: drhula] #970752 11/06/09 04:52 AM
Joined: Oct 2002
Posts: 15,887
kewlynx Offline
Toyota & Classifieds Moderator
*****
Toyota didn't make a hybrid engine; it's a popular mod.

Keep in mind with that setup that you cannot use a 85+ block, or you'll never get the timing chain setup correctly; difference of 3 links for deck heights.

As far as IDing the block itself, just shine a flashlight at the flat spot behind the alternator, and you'll see the stamp there.

Both the 20R and 22R heads have round exhaust ports. Also, a 20R carb has around opening; the 22R has a rectangular opening.


http://www.walkablecommunities.org/

Democracy is two wolves and a lamb voting on what to have for dinner. Liberty is a well-armed lamb contesting the vote.

**ubi apis- ibi salus**
Re: holley 4 bbl carbs and offinhauser intake on a 20r [Re: kewlynx] #970753 11/07/09 01:08 AM
Joined: Nov 2009
Posts: 13
drhula Offline OP
Need a Spot
is it possible to use a 20 r valve cover on a 22 r block? ill run the numbers and we wil all know what the engine is lol thanks for the help

Re: holley 4 bbl carbs and offinhauser intake on a 20r [Re: yodta] #970754 11/07/09 01:18 AM
Joined: Nov 2009
Posts: 13
drhula Offline OP
Need a Spot
yes it is a dual plane and i have a pic but not sure how to post it on here thanks for the info

Re: holley 4 bbl carbs and offinhauser intake on a 20r [Re: drhula] #970755 11/07/09 05:48 AM
Joined: May 2009
Posts: 177
Ralph Offline
Wheeler
I would think this would be an ideal setup.
I had the 390 holey on a 283 Chevy and it ran very well.

I've had the 360 dual port on a 2000cc engine and it worked very well also.

re-jetting may be the answer.

Good luck


Ralph

1991 Toyota 4x4 Standard Cab Pickup.
engnbldr cam and head.
Doug Thorley Headers
Home Made Cat Backs
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