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  #1  
Old 01-28-2012, 05:01 PM
lostmy47 lostmy47 is offline
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Cool TBI for Chevy 261 straight 6

Hi-
I am in the process of finishing the build on a replacement motor for my 1950 Chevy 1 ton truck.
Its a 261 straight six bored .080 over to make it 270 or a 4.4L.
Ive got a Offenhauser dual intake manifold on it and Fenton cast Iron headers.
There's a slightly hopped up cam in it but this motor is being built for torque not speed.

I am making decisions on intake now.

Initially I was going to run single barrel Rochesters, they are the epitome of "vintage" hot rod stuff.
Since I build and restore vintage motorcycles for people and ALWAYS make them more reliable, I realized how stupid I was being and decided to run 2 progressive 2 barrel Weber carbs. First I was thinking the Holley Webers from the Ford Pinto days, then I thought I'd run 32 36 DGEVs instead.

Wait I'm getting to the FI part!

The distributor for the 261 is shot so I've been shopping for a distributor. A friend asked me if I was going to go with fuel injection on the new engine.
DUH! I felt like I'd been hit with a hammer. I actually hadn't even thought about it but its a pretty brilliant thought.

After reading for a couple days I have some questions:
Is there a small 2 injector throttle body for maybe a 4 cylinder out there?
Is there a single barrel throttle body out there?
Injectors are stupid, right? they don't know what system they are hooked up to all they know is "spray" or "rest" right?

OK I'll start there.

I like the idea of FI I just want it to run properly without a ton of headaches.

All Suggestions and Ideas, appreciated. If I decide to do it I'll keep a log here and over at stovebolt.com. So people in both places can get there giggles in.

Jeremy
San Jose, CA
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  #2  
Old 01-28-2012, 05:14 PM
Bill USN-1's Avatar
Bill USN-1 Bill USN-1 is offline
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Default Re: TBI for Chevy 261 straight 6

To keep things simple for you and the ECM I would recommend using 2- 1barrel throttle bodies. I have a couple writeups in the FAQ's that will show the different styles. But there are many different ones avail.

The thing to keep in mind is that the injector driver in the ECM is designed for a specific load. So the TBI injector is a peak and hold style injector with a resistance of 1.5ohms.
The 4.3 V6 TBI system using the 122774 ecm like in the FAQ's here runs a 2 barrel throttle body. So it's designed to run 2 injectors.

To run on your dual carb manifold you simply run 2 1 barrel throttle bodies like off of a 2.5l (iron duke) 4 cyl from the S10.
Then you just run 1 injector wire to each throttle body.

The ECM has no idea and only cares that it is running 2 injectors of the right ohms.

I have also looked at the little geo metros and they have a 1 barrel TBI but I haven't measured the injector.

But look under the hood of any GM product with a TBI and you will find many options.

You know GM actually did this from the factory on the crossfire camaro. It had 2- 1 barrel throttle bodies. I have a couple of them also!!

The other option is to run a single manifold and run the GM 2.8 or 4.3 V6 throttle body with the same computer.

Take a look at the 4 cyl writes listed in the FAQ's(start here) for a couple examples.

HTH
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  #3  
Old 01-28-2012, 05:36 PM
lostmy47 lostmy47 is offline
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Default Re: TBI for Chevy 261 straight 6

Thanks Bill!
That's exactly what I was thinking. Two single injector TBs hooked up to the ECM as if it was a one 2 barrel injector.


Off to read more...

Back soon.

Jeremy
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  #4  
Old 01-28-2012, 05:43 PM
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BO185 BO185 is offline
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Default Re: TBI for Chevy 261 straight 6

I looked into this with my 235ci Chevy 6. Here's as far as I got.
http://www.binderplanet.com/forums/s...ight=Stovebolt

I did find a single barrel injector off a 2.5L TBI. Pictures are in the thread





You can adapt a Chevy HEI off a later 292 inline motor. Search Stovebolt HEI and google it.

Also google 235 TBI there are several out there.
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  #5  
Old 01-28-2012, 05:54 PM
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Default Re: TBI for Chevy 261 straight 6

Quote:
You can adapt a Chevy HEI off a later 292 inline motor.
Careful with that.
Read the GM HEI FAQ.

Just because people do it does not make it right.

And he came over here from the stovebolt board!!!!

Maybe he was looking for the correct information!
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  #6  
Old 01-28-2012, 09:03 PM
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Default Re: TBI for Chevy 261 straight 6

Quote:
Originally Posted by Bill usn-1 View Post
Careful with that.
Read the GM HEI FAQ.

Just because people do it does not make it right.

And he came over here from the stovebolt board!!!!

Maybe he was looking for the correct information!
Yes I Should have stated it better. I believe the last year 292's had big body 7-pin modules.

Here's one. http://www.stovebolt.com/techtips/hei_conversion.htm
Also you could mount the module outside the HEI.
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-73 Scout II- GM Vortec 6.0L 4L65E NP241
-73 1210 Travelette SV392, T-34, 60/14bff 4.56's 35's
-01 VW TDI Beetle- 50mpg or better
-55 Chevy 210 Delray 235/3sp
-56 Chevy Belair 4 door hardtop*next project* 5.3/4l60/3.08's


LSx swap info
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  #7  
Old 01-28-2012, 09:18 PM
Bill USN-1's Avatar
Bill USN-1 Bill USN-1 is offline
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Default Re: TBI for Chevy 261 straight 6

Yep, That's the one that doesn't work so well with EFI.
You need to look at the HEI FAQ.
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Click a link below that meets your needs! Either DIY or let me help.

COMMITED TO HELPING PEOPLE "PROPERLY" INSTALL EFI
Learn to do it right.


May be the answer to all your fuel injection needs!


WANTED-Holley Distributor
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  #8  
Old 01-28-2012, 10:02 PM
lostmy47 lostmy47 is offline
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Default Re: TBI for Chevy 261 straight 6

Quote:
Originally Posted by Bill usn-1 View Post
Careful with that.
Read the GM HEI FAQ.

Just because people do it does not make it right.

And he came over here from the stovebolt board!!!!

Maybe he was looking for the correct information!
I came over here to find what others had done and made work.
I see this as a way to stay interested in getting this project of mine finished! LOL

So BO185, did you get any further?

Jeremy
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  #9  
Old 01-29-2012, 10:03 AM
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Default Re: TBI for Chevy 261 straight 6

Actually no. I don't drive the car enough anyway to need it, so a abandoned the project.


I think it would be fine with a single 4bbl manifold and a TBI adapter and run a reg TBI unit off a 4.3L. I didn't like the way a single bbl manifold necked down with an adapter.

Here's one with a 250 HEI guy mounted the module on the fender for his TBI swap.
http://i175.photobucket.com/albums/w...s/100_0853.jpg
__________________
-73 Scout II- GM Vortec 6.0L 4L65E NP241
-73 1210 Travelette SV392, T-34, 60/14bff 4.56's 35's
-01 VW TDI Beetle- 50mpg or better
-55 Chevy 210 Delray 235/3sp
-56 Chevy Belair 4 door hardtop*next project* 5.3/4l60/3.08's


LSx swap info
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  #10  
Old 01-29-2012, 12:05 PM
lostmy47 lostmy47 is offline
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Join Date: Jan 2012
Location: San Jose
Posts: 4
Default Re: TBI for Chevy 261 straight 6

Bill has me thinking that a pair of those 300CFM Holley TBs may be the answer?
That and a v6 TBI system.

I saw that the adapted distributor didn't work because it was rotating the wrong way, but I didn'T see the gm hei FAQ..

I may be blind.

Jeremy
FNG

San Jose, CA
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2 barrel , 261 , body , build , cam , chevy , chevy 6 , cylinder , distributor , engine , fuel , fuel injection , holley , hot , part , replacement , restore , start , stupid , tbi , throttle , throttle body , truck , vintage , weber

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