Offy tri-power stalls when in gear

So one obvious question comes to mind with this. If I can tune this with only one carb......you probably see where I'm going. With the cam, larger valves (I'm not positive but I think the valves were upsized ) and headers shouldn't I need more than one single 1940 Holley can provide? (I'm assuming stock jetting, but don't actually know)
I have some sheets of gasket material I should be able use for this.

I'll try to get a video of how the car acts before I do this just for comparison.
 
You wouldn’t be tuning the engine with the one carb. You would be doing this as a way to diagnose where a problem may be. If it runs well on just the center and you don’t find any problems with vacuum leaks or timing issues then move on.
When your running on the one in the middle, and all is well, try each of the outer carbs in the center by themselves and check them out. It’s possible that you could have a bad carb that may need rebuilding.
 
Gene 64 2dr":2z3nfrx5 said:
You wouldn’t be tuning the engine with the one carb. You would be doing this as a way to diagnose where a problem may be. If it runs well on just the center and you don’t find any problems with vacuum leaks or timing issues then move on.
When your running on the one in the middle, and all is well, try each of the outer carbs in the center by themselves and check them out. It’s possible that you could have a bad carb that may need rebuilding.

That makes sense. Thanks for information.
If I'm going the route of swapping each one into the center position it sounds like I may be better off just removing the outer two at this point?
 
:D Like your Heathkit tester.A friend of mine that I went to school with built one when he was in high school.in 63 or 4.He is still using it today.He is one year younger than me.I`m 73.Trying to tune multipul carbs can be enough to make a feller want to pull his hair out if you`ve never done it before. I`ve seen experienced carb tuners just about have a nervous break down trying to get their setup tuned.But don`t give up.You`re getting there.
Good luck.Have fun.Be safe.
Leo
 
If I'm going the route of swapping each one into the center position it sounds like I may be better off just removing the outer two at this point?

... yes you could remove them but the simple solution is to make two block-off plates to look like gaskets from thin metal and then temporarily place between under carb .

My original three carb Offy setup when first started, I found only ONE of the three 'rebuilt' carbs ran well alone - and it had been in front position. Tested individually, center carb bogged off idle and rear carb, I never got to run right . I have an inventory of questionable or experimental carbs for the Offy Tri-Power.



have fun

.

For a while, I built and ran a hi-rise plenum to sit on the three Offy port adapter and accept a big 2 Bbl for ease of tuning. It did run more consistently but ultimately wasn't any faster ...

 
Well, it looks like I now have something to do this weekend.

I have no idea how long these carbs have been sitting with or without gas in them, so seems like a good opportunity to take them off and open 'em up and see what's going on.

***With only one carb on the engine, what's the expectation ? How do I know what "good" looks like ?
 
that's a fine carb to run the car on (wuz designed to do so). There R better 1Vs tho, but do U wanna buy them right now ($300 - 1,050) ?
(I forgot if U need SCV, have LOM dizzy).

Block off the others well. Tune on that one, even drive it.
 
chad":krdwved2 said:
that's a fine carb to run the car on (wuz designed to do so). There R better 1Vs tho, but do U wanna buy them right now ($300 - 1,050) ?
(I forgot if U need SCV, have LOM dizzy).

Block off the others well. Tune on that one, even drive it.

I can tell you that the ported openings are plugged and there doesn't seem to be anything where the SCV goes. It's not threaded and appears to be a blind hole. Option perhaps ?

Dizzy is a mechanical advance mallory dual point.

Thank you!
 
thegreyghost":b4sbboy8 said:
Had a little time to play around today.

Got a video of it showing the tach at 600 and the dwell setting - about 27.
Got another video of it at 800 and then the dwell - about 34.

Not sure why there's that big of a difference, but I haven't measure the points yet.
I have both outer carbs disconnected and confirmed that I can get it to stall by turning the mixture screws in. Right now all three are 1.5 turns out.

Took if for a short drive - surges with the throttle. Doesn't have much get up and go yet.

videos are rpm first, followed by dwell.

https://drive.google.com/file/d/1eQ9IA1y6WARP9kZXpNcSU4E6TbnaUZLX/view?usp=sharing
https://drive.google.com/file/d/1JKrDGdhWNs6dETBhHzThKOu9d1iKNKoX/view?usp=sharing

:shock: :wow: it sounds like we are all just chasing our proberberal tails here or getting deep in the tall weeds!

Did you ever get the dwell set right yet or check if the distribor shaft moves sideways? IMOP these three items of tuning that I stated in my above post #36 need to be handled first before ever doing anything with the carb's. The above videos still don't work, but if you are able to get it to idle down too 600 RPM and stall the engine when turning the mixture screws in then the carb's idle circuits are working. By the way you certainly right it doesn't mater about the carb's having SCV or not to match with an old LOM system because in this case your distribtor is a duel point that only has a mechanical advance system i.e. No vaccum advance. Good luck (y) :nod:
 
Hi, I stay focused on the ignition and distributor. The dwell should be steady. A varying dwell shows a worn distributor.
A low dwell number means the points are open too much. Set the gap or adjust the dwell one set of points at a time.
Figure out the ignition first or you are just waisting your time on the carbs.
Good luck
 
bubba22349":3s9vzlzr said:
thegreyghost":3s9vzlzr said:
Had a little time to play around today.

Got a video of it showing the tach at 600 and the dwell setting - about 27.
Got another video of it at 800 and then the dwell - about 34.

Not sure why there's that big of a difference, but I haven't measure the points yet.
I have both outer carbs disconnected and confirmed that I can get it to stall by turning the mixture screws in. Right now all three are 1.5 turns out.

Took if for a short drive - surges with the throttle. Doesn't have much get up and go yet.

videos are rpm first, followed by dwell.

https://drive.google.com/file/d/1eQ9IA1y6WARP9kZXpNcSU4E6TbnaUZLX/view?usp=sharing
https://drive.google.com/file/d/1JKrDGdhWNs6dETBhHzThKOu9d1iKNKoX/view?usp=sharing

:shock: :wow: it sounds like we are all just chasing our proberberal tails here or getting deep in the tall weeds!

Did you ever get the dwell set right yet or check if the distribor shaft moves sideways? IMOP these three items of tuning that I stated in my above post #36 need to be handled first before ever doing anything with the carb's. The above videos still don't work, but if you are able to get it to idle down too 600 RPM and stall the engine when turning the mixture screws in then the carb's idle circuits are working. By the way you certainly right it doesn't mater about the carb's having SCV or not to match with an old LOM system because in this case your distribtor is a duel point that only has a mechanical advance system i.e. No vaccum advance. Good luck (y) :nod:

I checked the shaft and the plate. I cannot find movement in either, but I agree the values I stated and stand by suggest differently. The shaft I'm fairly certain on. I poked around on the plate and couldn't see any movement, but I may be missing something. I'll recheck.
Spark plugs are set at 0.40 best I can tell.

I'll check the videos and repost tomorrow. Of course they work for me when I try them, so I need the feedback - thanks for letting me know.

I still need to measure the points gap on each set and will tackle that this weekend.

It might be a day or two but more info to come.
 
I tried both links from a different computer not logged in and they worked.

Can someone confirm for me whether or not they can access them now?

Thanks.
 
thegreyghost":mzkpc7wk said:
...Can someone confirm for me whether or not they can access them now?...
'S OK, no matter
and
when I click on the 'right pointing triangle' in the vid window (it gets 2 that point OK)
an error msg opens.
1) I have a mid '08 MacBook Pro (15 inch) running OS10.11.6 (El Capitan) w/Safari 11/1/2;
2) so like my vehicle it is an older model and may not meet today's standards.
:nono:
:LOL:
:oops:
 
These are thefirst two videos from your other post before, I seen them and they used to work for me but now they don't.

https://drive.google.com/file/d/1hx9uMHOw_rZOxy1RgXxSBBfYlcmWnuOS/view?usp=sharing
https://drive.google.com/file/d/1iCUtnjzOgkvAkf5eLI5n5yzXULIDEUOU/view?usp=sharing

Second pair of videos couldn't get them to work on severial different tries.

https://drive.google.com/file/d/1eQ9IA1y6WARP9kZXpNcSU4E6TbnaUZLX/view?usp=sharing
https://drive.google.com/file/d/1JKrDGdhWNs6dETBhHzThKOu9d1iKNKoX/view?usp=sharing

Looking at the links can't see any reason why they shouldn't work maybe they only work when you are also logged on to this site? Don't know I just get an "invalid parameters" warning on all four of these video links. Not a Google user so not being logged on to their site might also have something to do with it too. Good luck (y) :nod:
 
ditto
2X wha he ^^^ said
 
bubba22349":3irgc4ow said:
These are thefirst two videos from your other post before, I seen them and they used to work for me but now they don't.

https://drive.google.com/file/d/1hx9uMHOw_rZOxy1RgXxSBBfYlcmWnuOS/view?usp=sharing
https://drive.google.com/file/d/1iCUtnjzOgkvAkf5eLI5n5yzXULIDEUOU/view?usp=sharing

Second pair of videos couldn't get them to work on severial different tries.

https://drive.google.com/file/d/1eQ9IA1y6WARP9kZXpNcSU4E6TbnaUZLX/view?usp=sharing
https://drive.google.com/file/d/1JKrDGdhWNs6dETBhHzThKOu9d1iKNKoX/view?usp=sharing

Looking at the links can't see any reason why they shouldn't work maybe they only work when you are also logged on to this site? Don't know I just get an "invalid parameters" warning on all four of these video links. Not a Google user so not being logged on to their site might also have something to do with it too. Good luck (y) :nod:
Alrighty. I'll see if I can find a better way to post. Tomorrow I should have points measurements, and I'm going to recheck the dampener to make sure it isn't moving.
 
right ign then carb
 
Hi, the videos of RPM worked here.
Work on the points and take a video of the meter, set on dwell, and raise the RPMS so you can see what the dwell meter does.
Hopefully the dwell will hold steady.
Old distributors have oil cups for lubrication, I wonder if your Mallory does.
Good luck
 
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