gas starved?

T

traveler

Member
I tried to find a thread on this - 2300 Holley carb.
We rebuilt it....but did not check the jet size...so we don't have any idea of jet size.

When its cold....and we hit the gas hard....it hesitates...or even pops....

It even stalls sometimes and that is bad at an interestion.

So I guess my question is...if everything else is good and right...plugs, timing...dwell...vac....
And we still get hesitation or back fire...does that sound like undersized jets?

I don't want to take the 2300 apart again...but maybe I need bigger jets?...and if so...what size?

Thanks guys!
John
 
I had this problem when mine was cold and I advanced the timing up and it has never done it again. Also maybe your not getting a good accel pump squirt. There is a article on here about timing, do a search for “power timing” I am betting this helps a lot with the hesitation
 
If the jet size is oem for the application, that is not your problem. But we'd need to know exactly what the setup on that carb is. As Robert advised, educate yourself first!

If the ignition system is up to snuff and base timing is appropriate for your application, then you can deal with the carb. You must verify proper accelerator pump action by observing the pump shot with the engine dead, looking down through the venturi with the choke plate open.

You must have two forceful streams of liquid fuel being discharged from the pump nozzle into each venturi with no lag, no weakness, no "blubber", etc. Through the full pump stroke. Otherwise you have accelerator pump system issue which is real simple to deal with.

Do the test and get back to us with the results.
 
Accel pump shot is large and full...stroke on accel pump is long and full.

So its not that...whew..

I'll try to put you there...

Choke to start.....
Choke for about 5 min warm up...back off choke..
Allow further warm up....ok...good...choke is not wide open

hit gas peddle...accel works...but engine starves and slows for a few seconds....and then "catches up".....and races

its like a a curve up with a dip in it.

I will re-check timing and advance right how
thanks!
 
Well....hmmm

we got everything fixed....and boom....lifter died.

Its a tired ...only 130 lbs of compression...I think we should call her dead.

Sad...it ran sweet for a while...strong...no smoke...put alot of time into her.

Oh well...maybe a 350 crate motor...hmmm
im not a purist....I just want a reliable engine.

Thanks michael and crew.
John
 
traveler said:
well....hmmm

we got everything fixed....and boom....lifter died.

Its a tired ...only 130 lbs of compression...I think we should call her dead.

Sad...it ran sweet for a while...strong...no smoke...put alot of time into her.

Oh well...maybe a 350 crate motor...hmmm
im not a purist....I just want a reliable engine.

Thanks michael and crew.
John
Click to expand...

No! No! No!

Ya got the same old "rocker not oiling" deal that 90% of everyone else around here has faced! That is what happens when this old shit sits neglected for years. And we have written the book on what to do about it, no where else on the 'net will you find the diagnostic info ya need to fix this except here!

Begin at the top of the engine tech sub-forum and work your way through the first 50 or so threads, they are nearly all addressing the same thing!

Yore motor spit a pushrod because the rocker shaft is not lubing. Pop the valve cover on the offending side and take a look, it will be perfectly obvious what's going on...then ask nelson about trying to compare this old ihc junkiron with a honda!

Scruu that "alternative engine" deal with a donkeedong, fix this motor and don't give up so ez! You already done the hard shit man!
 
Is 130psi really that bad ?

Just a guess but wouldn’t swapping a 350 in take 10 times the time and 5 times the $$$ as fixing the IH engine ?
 
130psi cold compression is actually excellent for an engine of unknown internal condition.

These engines do not exhibit high cylinder cranking pressures, they are truck engines with an approximate cr of 8:1.

Again, you cannot compare "norms" for any other typical deetroit v8 motor with the ihc-produced sv and I-4 engines, they are unique animals and must be diagnosed as such. Ihc never published "typical" compression pressures in any of the service literature or specifications.
 
Well ....ok !

We will pull teh covers and see about the oiling...maybe just swap out a push rod...that would be awesome!!

I was going on what my Dad said..that 130 was low and probably meant old rings and it would give out in other areas.

If we do find a dry lifter bar....then do we just pull and clean it?
Is it that simple?

I was thinking a 350 because they are easy to get (unilke the IH)
and I didn't want a long term engine what would soak me on $.

Maybe I m wrong...will report findings.
Thanks guys...sorry I gave up so fast.
John
 
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