Need Jets, Pony Carbs wants 8 bucks a piece....

[blueroo]

could I use Holley jets from Summit....$45 for 72 jets. If the Holley jets are too big to thread into the 1100, could I use a tap and retap the 1100's jet area?

 

[Harte3]

I have heard of that being done on other carbs like the Holley 4360 4v carb because it had a metric sized jet none of which are available since they are obsolete.

 

[Bort62]

Buy 1 from pony in the smallest size they offer and drill it out as you go.

 

[blueroo]

Wow I feel like an idiot for not thinking of that. What type of bit should I use though? I've heard jets are rather small.

 

[wallaka]

Well, you'll need a variety. Do you mean what brand? I can't help you there. Just get a "numbered" set, that will be what you commonly find. If the decimals aren't on the set, there are surely conversion charts on the Web.

 

[Bort62]

Well, you'll need a variety. Do you mean what brand? I can't help you there. Just get a "numbered" set, that will be what you commonly find. If the decimals aren't on the set, there are surely conversion charts on the Web.

Yup. Get a number drill index. Jets are medium-small.

As a reference, I drilled mine out to ~ .107 IIRC.

 

[yodabiri]

I ran into the same problem. Just go to the junk yard and grab some jets out of old fords with autolite or motorcraft carbs. Look for the motorcrafts on the 3.8L v6 engines that came in the early 80's mustangs. these will have the 47 size jets. Then use numbered drill bits to drill the size you need. The guide I have found for doing this is drill bit size 50 is a 70 jet, drill bit size 49 is a 73 jet. drill bit size 51 is a 67 jet. I am using a jet I drilled out to be 0.070 or 70 for short. It works great for the autolite 1100, but in my application the car is running a bit lean usually (vacuum leak somewhere).

I hope that helps.

 

[xctasy]

Drilling is okay for 1-bbl carbs, but its a very bad idea for 2-bbls. Any time you drill a jet, you hurt the chamfer, and the jet doesn't always flow better than the orginal undrilled. The reason is that even close limit jets from Holley have a variance of not more 4.5% in flow rate, and you drill, the internal smoothness and chamfer and resulting flow rate cna drop.

As an example. A 2150 Holley with two 53 jets will be worse when drilled out as the chamfer comes of the jet when drilled, and the calibrated variance will be greater when drilled.

If its a 1-bbl carb, go for it, but if you drill it out a lot, you'll have to re-establish the 60 degree include angle chamer by another process.


For me, Pony carbs 8 bucks a jet is just fine.

 

[page62]

Perhaps we could suggest some sizes to try...

When I bought my carb off ebay, it had a 60 jet. Too lean -- nasty flat spot under acceleration. I swapped it with a 64 jet from the crapped-out carb I got with my engine, and it runs pretty well. I could possibly go 1 size bigger, but I'm okay.

This is on a 170 that has never been bored out.