Which Replacement Carb?

Hotfingrs · #1 (**permalink**) 12-12-2009, 07:50 AM

Davinci cost a friend in Delaware his engine....

Bill Wells · #2 (**permalink**) 12-12-2009, 08:10 AM

Ditto to those that have mentioned Pro-Systems > They have done 2 for me : 1 for a blower and the other for a non blower carb - no choke on either and always starts right up ,even after long storage.

when they arrived I had them checked on a chassis dyno and they were right on right out of the box - no adjustments needed, jets were perfect, air to fuel ratio perfect range. we adjusted idle setting and that was it .

Patrick will give you the best custom carb for your engine specs and needs . Bill

Jim Vander Wal · #3 (**permalink**) 12-12-2009, 08:15 AM

ProSystems.

Nothing small time about these guys. Holley HP 4150 based, parts are everywhere.

Patrick and his team wet flow every carb and you can send in your engine and car specs so the carb is built for you.

Great service and support. Reasonable prices too.

Jim

mrmustang · #4 (**permalink**) 12-12-2009, 08:21 AM

Based on the specs of the engine, I suggest a simple yet dyno tuned Holly 750CFM double pumper from their HP series.

http://www.holley.com/0-80528-1.asp

Again the trick is to find someone with a chassis dyno who can properly tune it for you. Once you bolt this one on, you'll never go back to anything else.

Bill S.

jhv48 · #5 (**permalink**) 12-12-2009, 08:45 AM

So far, you guys are thinking the same as I am.

I can get a Holley HP already jetted and modified for my engine from Pro Systems for about $700 and simply bolt it on.

Or I can get a new HP for about $450 and then spend another $300-$400 on tuner and dyno time to get it dialed in properly.

Pro Systems is looking like the way to go!

I had a BG on my last Cobra and, after dismantling it and cleaning out all the shavings, it ran like a champ. But it took me about three weeks and $$$$ to get it dialed in properly. Looking to do it the lazy man's way this time.

DAVID GAGNARD · #6 (**permalink**) 12-12-2009, 02:36 PM

Quote:

Originally Posted by Hotfingrs

Davinci cost a friend in Delaware his engine....

I've got a high dollar 750 cfm Davinci paper weight.......all but cost me an engine also..........

Have had nothing but good luck/service with my Demon carbs, love em............

David

Tom Kirkham · #7 (**permalink**) 12-12-2009, 07:02 PM

How much for the paper weight?

DAVID GAGNARD · #8 (**permalink**) 12-13-2009, 05:28 AM

Quote:

Originally Posted by Tom Kirkham

How much for the paper weight?

Tom:

They built this carb for me in the early 90's and I had to send it back to them twice for problems. Finally I gave up on the carb....

Since then,I've used it for parts, but the main body and the bare bowls are still there. I robbed the jets/needle & seats and floats out of it to use on other carbs........

You really DON'T want whats left!!!!!!!!!!! Don't know what they did wrong, but all it did was dump fuel in the engine at about 3 times the rate it should have.............

David

Tom Kirkham · #9 (**permalink**) 12-13-2009, 08:08 AM

Do you still have the metering blocks?

Can you post some pics?

DAVID GAGNARD · #10 (**permalink**) 12-13-2009, 09:59 AM

Quote:

Originally Posted by Tom Kirkham

Do you still have the metering blocks?

Can you post some pics?

I'm pretty sure the metering blocks are there. I'll gather up the parts and take a few photos.......

About the only good thing I can say is I like the teflon like coating they coat the carb with inside and out and the butterflies have a black teflon like non stick coating, other than that, the carb was junk.......

I bought a new 750 vac.sec. carb and ran it on my engine for a month or so and it ran well, got about 20 mpg on the highway.Then I decided I wanted more and read about Davinci in some magazines and he's not that far from me, so I contacted him about going thru my carb. Filled out a very extensive spec sheet on my engine and car and what I used the car for and what I was looking for in the carb and sent it all to him, got the carb back and bolted it on and it ran SUPER SUPER RICH from the word go and had a terrible off idle bog. If you stood behind the car (65 Fastback, 351-W) the fumes would burn your eyes and choke you within seconds.....Fuel mileage went down to 10 mpg on the highway from 20 mpg, not good!!!!!!! Sent it back twice and the results were about the same as the first time.... In the meantime I bought a remanufactered Holley 600 from Auto Zone to be able to use my car and it never ran better.......

I tested the car with both carbs on the street and at a 1/4 dragstrip and that's when I put the 750 on the shelf..........BTW: is a 3310 model, 750 vac. sec. carb.......

I now run a 20+ year old, third hand, Holley 600 DP a buddy gave me that he was throwing away (said it always ran too rich, it was jetted about 8 sizes too big) and I rebuilt it myself. Car idles like my wifes car and gets 23 mpg on the interstate cruising at 75 mph and runs 12.90's in the 1/4,down from 13.30s as before!!!!!!!!!!!!!!!

I bought a couple of Holley rebuild books and studied them and got a few old Holleys to practise on and now do all my own carb work, nothing fancy, just standard rebuilds with top shelf stuff and I'm happy with the results, so far.......

David

Night Enforcer · #11 (**permalink**) 12-15-2009, 04:27 PM

Hi Greg-- I sent you a PM regarding your carb.