Fall Drive

[atallamcs]

I took the Harrington out today for a drive through the Napa and Sonoma Valleys. Made it home without anything dropping off the car or breaking down. Sure is nice when they perform perfectly. I have a 1725 with twin webers--I think I need to go to a different fuel pump rather than stock--any thoughts? I heard the Carter 4070 was ideal?
Bill

 

[jumpinjan]

Yes, when they are right, they run great. Ian drove his Harrington down to Daytona FL, for the United. He said it ran great all the way down.
Jan

 

[serIIalpine]

I'll sell you my carter. I'm switching with the SU that was intended for a pair of weber/delortos.

Eric

'62 SerII

 

[alpine_64]

Bill,

I switched to an electric puller pump when i went with the webers, I found that at higher RPM they would drain the stock pump. You need to be careful where you mount the electirc pump and how as they can be quite noisy, and i would assume this would be a larger issue in a closed car like the Harrington. You may also want to consider a PSI regulator. I used a local brand (australian pump) so not much help to you. However what you are looking for is a 3.5psi pump, i also used an exhaust insulator to mount it on and connected it to the back of the battery box, close to the tank, protected from road debris.. but you must insulate it or you will hear it hammering in the battery box.

 

[serIIalpine]

This is the pump I was talking about: http://www.holden.co.uk/displayprod...gCode=0100&agName=SU+Fuel+Pumps&pCode=015.456

I am running the Carter with 2 count them two in line filters one before the pump and a paper element before the weber fuel pressure regulator.

I have had nothing but problems with this setup. I have yet to see the same fuel pressure reading twice and I'm on my second gauge which is mounted between the two carbs. I have seen it as high as 7 lbs and as low as 0 with the the car running pretty much the same except for when the needles stay open and the carbs flood. I replaced the needles and seats and the fuel filters and the pressure gauge and I am constantly diddling with the pressure regulator. Nothings seems to fix the flooding and starvation problem.

I just did a 200 mile drive with a bunch of friends in the mountains northeast of LA and while my car was flooding the carbs and starving for gas at the high rpms my friend in the 2 liter lotus elite with twin dellortos and a SU pump had no problems whatsoever.

Just a thought.

Eric

'62 SerII

 

[atallamcs]

Harrington--Fuel Pump

Take a look at what is being recommended here.

Fuel Pumps and Fuel Pressure:
Fuel delivery is critical to the proper performance of any Weber carb. From a basic 32/36 DGEV to a set of Triple Sidedraft DCOE's. Webers rely on a stable full float bowl in order to mix the fuel and air correctly. Mechanical pumps very rarely do this. They pulse fuel instead of giving a smooth even delivery and the amount of fuel varies with engine RPM.

A Proper Electric Fuel pump will give the best performance and most stable tuning for any Weber carb application. We use only High Volme and Low Pressure pumps. Webers work best at approx 4 psi of fuel pressure (Not 2 psi like many of the older books stated.) and you need Volume not Pressure to keep the float bowl full.

We ONLY use the Carter Rotary pumps. They are High Volume (60-70 GPH) but only 4 psi. This is PERFECT for all Weber applications from a Single 32/36 DGV on a Truck, Jeep or Car to a Triple Sidedraft setup on a Road Race car making 300 HP...This pump DOES NOT and SHOULD NOT use a Pressure Regulator for any reason. More--http://www.racetep.com/webfuelspark.html#webspark
Bill

 

[Jim E]

Yes, when they are right, they run great. Ian drove his Harrington down to Daytona FL, for the United. He said it ran great all the way down.
Jan

Just curious, was it the same tune on the Webers as it had at the Invasion? Been a while since I had monkeyed with 40s

 

[serIIalpine]

So I drove my SerII to work the other day because it was a combination of 20 freeway and 10 mountain miles to work and I found that at 4700+rpm that if I get on the gas I have a little stumble.

I bypassed the fuel pressure regulator and drove it home. While the stumble was gone I noticed that I'm getting a reading of 7.5-8 lbs on the fuel line between the regulator. This, I can't imagine, is good.

I don't understand why you need a pump that puts out 70-80 gph. A pump that puts out 8 gph will sufficiently feed an engine that gets 12 mpg at 100mph.

I know I'm running rich but not that rich.

I still don't know why the SU fuel pump isn't a better option. A pump that can feed three webers with no pressure regulator I would be more than sufficient.

Just a thought

Eric

'62 SerII

 

[atallamcs]

Fuel Pump, stumble etc.

Maybe you want to read my earlier post just below--the professionals give the specs as to no fuel pressure regulator, and much lower pressure than you are running. I think the problems you described might be resolved with their suggestions.
Bill

 

[napa 1]

I'm running the exact fuel pump that Bill posted information on. So far so smooth. I'm finding the car to be quick and responsive at all rpms, no stumbles or hesitations.

 

[64beam]

It seems that there are some mixed reports on the Carter fuel pumps. When speaking to a local carby specialist, he suggested the carter with a regulator and that the ouptu of the carter 4070 is required for twin side draughts. I have on my Alpine a Facet solid state fuel pump which puts out approximately 35gph with my twin dellortos on a standard 1725. I have also seen an SU pump with a mild 1725 with twin Dellortos also.
What ever makes it run well I suppose.