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Old 01-29-2010, 06:35 PM   #99
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The Hedmann Headers are in; the 2.1/2" exhaust has two 1 meter long straight through 5" dia custom made mufflers, Electric Fan fitted and tune up. What do I get?12.5-13.5 miles per Imperial Gallon! all that for the same juice?
Does imperial gallon contain ethanol?
Just did the math and your gallon is 20% larger than our U.S. gallon so my 9.5-10 mpg with ethanol at about 10% is close, without special muffler.
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Old 01-30-2010, 07:21 AM   #100
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Chuck, angles are everything as is balance of the new shorter driveshaft. If you can find another shaft to shorten and retain your old tail housing and drive shaft just in case you need to remove the GV for repair at a later date.
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Old 02-02-2010, 12:28 PM   #101
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Glen, that is a very valid point, although the possibility of finding such a shaft here may be remote, to say the least! I will ask around just in case..... Yes! I like that idea a spare shaft - excellent!

This weekend I hope to complete the main change over, then with the "nuts-n-bolts" bit out of the way I can get on with the angles etc., and see what is necessary.

Watch this space; as they say.

Out of interest, the controller.... I had an aftermarket control panel supplied with the unit instead of the GV's own. Has anyone had issues with such controllers?
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Old 02-02-2010, 12:36 PM   #102
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Quote:
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Does imperial gallon contain ethanol?
Just did the math and your gallon is 20% larger than our U.S. gallon so my 9.5-10 mpg with ethanol at about 10% is close, without special muffler.
Yes - OK I spent the bucks on silencers (sorry mufflers). The story goes that when I bought some parts from Summit, I asked about ROUND mufflers and they sent me.... wait for it.....! Little 18" long jobs - Glass Packs? - that more or less cracked every window pane in the cottages along our narrow roads, particularly if a hill was involved. The performance was good but the noise... great on a Charger or other type of racer but a MH? I don't thinks so. Even with two each side it was a case of ..."we know who is coming along the road...... about a mile away!"
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Old 02-03-2010, 01:58 PM   #103
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Chuck, I hooked Flowmaster 70's to my system. They are not round and we installed them on a 45 degree angle for whatever reason. They are very heavy and sound quite nice but are not too loud.

I have one pipe cross over above the rear drive shaft and both exit out in front of the drive axle on the driver side. So thinking of the right hand drive world all you need to do is have them exit on the passenger side and therefore have the noise if any pointed in the polite direction.
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Old 02-11-2010, 10:18 AM   #104
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OK so I've been reading the mileage stuff posted and I want to know if anyone installed a Banks on their AS. I just bought a 1984 310 because I like to restore stuff and I am sick of on-board computers like all of our late model cars have. The 1984 has a simple distributor, Wires, Plugs etc., and I have the expertise to overhaul the Quadrajet Carb if needs be. Anyone with Banks experience? On the maiden voyage from Amarillo to Lubbock the 1984 got 10MPG. 140 miles 14 gallons reg=10MPG Right?
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Old 02-11-2010, 10:58 AM   #105
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Just wanted to say hi to everyone
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Old 02-12-2010, 07:11 AM   #106
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Welcome Bobby!

KMPRO, 10 is outstanding on a 310 in my book. Do you have a GearVendor? What speed was the test done at?

With a 60 gal. tank it's easy to get readings all over the map when refilling. Just a little change in angle will allow more or less gas to fill the tank. Not that I'm doubting your results I'm just jealous.

There are a few folks on the board who have Banks units but most are on newer chassis I believe. Many of us have done all we can with headers and exhaust work and I for one have built a custom air intake (check my photos for an easy DIY). Add an MSD box for ignition and finally if you're done with the Q-Jet you can go TBFI. It's only money right?
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Old 02-12-2010, 07:37 AM   #107
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Amarillo to Lubbock the 1984 got 10MPG. 140 miles 14 gallons reg=10MPG Right?
10 sounds great for an 84 without computer or mods.
Depends on how you determined 10 gallons was used and that speedometer is reading right.
In my car I can have the computer calculate but you don't have one on the AS.
It takes a couple of fillups to get a good average as the station pumps can shut off at different points.
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Old 02-12-2010, 08:55 AM   #108
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I am satisfied that the 10 MPG wasn't a false fill of the tank. Speed was 65MPH temp 40 degrees F. TP was max. One M/H I had years ago I replaced the carb with an elec choke Carter 650 CFM 4BBL and that increased mileage by 2.3 MPG Average. It's only money. I have always wanted to install an Edelbrock Performer intake manifold on a motorhome and see if that improves mileage and torque. I spent too much time with racing guys I guess. One thing that can really affect mileage and performance is the crossover under the carburetor in the intake manifold. They will occasionally plug up and then the manifold doesn't warm up properly and performance suffers. If I ever have that happen again, Stock manifold will go to trash and Edelbrock will replace it.
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Old 02-12-2010, 11:13 AM   #109
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Choke

Here is what I know about chokes.

The manual calls for adjustment to be done while the engine is cold and the choke is closed.

The problem is the bimetallic spring that heats up from the manifold duct loses its strength over time and does not open the choke fully and the engine runs rich.

Since we start the infrequently but travel long distances it is imperative to get the choke opened fully.
Get the engine hot and adjust the choke to fully open. The engine will start hard but it will operate correctly at temperature. At startup you can keep the engine running by using the accelerator pump.

The solutions are to install the electric choke or a manual choke cable.
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Old 02-12-2010, 03:20 PM   #110
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We've had discussion in the past about the relative carb size and at 650 cfm I think you'll find the best economy. Opening a 4 barrel on a 454 is like flushing a toilet and converting money to noise so why make the toilet bigger? It's interesting that the smallest least expensive TBI is still a 750.

So here's the question ... what was the tach turning at 65 mph?

10 mpg is still pretty darn good without an overdrive on a 31' coach.

And has Lubbock to Amarillo always been a 140 mile trip? Mapquest calls it 124. or 8.8 mpg..... enquiring minds want to know. Just kidding....
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Old 02-12-2010, 04:47 PM   #111
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If its any interest, I had my Qjet rebuilt by Dick Paterson at Springfield. He replaced the hot air choke with an electric fitting. That made all the difference in gas miles, and runs much better too! As a bonus, if I don't want too much choke, I just leave the ignition turned on for a few seconds more before starting. That gives time for the choke to start opening. - Works every time.
email: dick@paterson-gmc.com web: www.paterson-gmc.com


Another little problem I found fitting the GV, the balance pipe was in the way of the now new position of the trans brake! I did allow some space when fitting the new exhaust, but I am about 1.1/2" shy of clearing the pipe - so I have cut it out for the time being to complete the GV fitting.

So now; do I go for all pipes down the driver-side (allows space for a second Propane tank - a smaller narrow one between drive shaft and chassis for domestic L/gas and replace the existing Propane tank with the same size if not larger one with bottom take off for engine conversion) Or join up the pipe again, or do away with it altogether!

Any thoughts ? Chaps? mmmmm?
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Old 02-13-2010, 07:13 AM   #112
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Quote:
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...... I have always wanted to install an Edelbrock Performer intake manifold on a motorhome and see if that improves mileage and torque.
This is the route I'm taking on our 1974 Argosy 454. I've installed an Edelbrock Performer 2-O 2161 w/o EGR intake with an Edelbrock 600 cfm carb (can't remember the number off the top of my head). The engine is built and ready to go back in the motorhome but I haven't had time to finish the install. Hopefully sometime this summer.

I chose this combination for the low end torque because we will be towing a 31' Excella trailer with our 20' Argosy motorhome. The trailer is being converted to a two car race car hauler for our Triumph race cars. So I felt low end torque was a big requirement for us.

Brad

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