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 Post subject: Running Alky
 Post Posted: Mon Sep 12, 2011 10:31 am 
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Hey All,

Buddy lent me a 950 APD alky carb to try out. I will be running a dual holley black pump setup.

Any tips? Will the timing need to change?

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 Post subject: Re: Running Alky
 Post Posted: Mon Sep 12, 2011 2:21 pm 
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Don't take this "personal" but, I can't wait to see how THIS works out! \:D/ =;

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 Post subject: Re: Running Alky
 Post Posted: Mon Sep 12, 2011 3:25 pm 
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Am I setting myself up for failure already? If this really works out, a mechanical pump will be in order.

Carb has been run on engine that is similar to mine and should be pretty close. I am going to give it a good cleaning as it has been sitting a bit.

Anyone want to venture a guess as to what it will pick up over my dominator?

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 Post subject: Re: Running Alky
 Post Posted: Mon Sep 12, 2011 4:18 pm 
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FYI, it won't pick up over your Dominator, IMHO! ;-)

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 Post subject: Re: Running Alky
 Post Posted: Mon Sep 12, 2011 4:28 pm 
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Interesting. Why do you say that?

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 Post subject: Re: Running Alky
 Post Posted: Tue Sep 13, 2011 10:16 pm 
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fourtenposi wrote:
Interesting. Why do you say that?


Difference in carb CFM for one.

2. Those 950 carbs have somewhat of a bad reputation from what I've heard.

3. With that much CFM and what are probably .180 ID booster passages I'd be wondering if you can get enough fuel through it especially with single needle seat bowls and electric pump.

4. My engine is quicker on gas than it is on methanol but not by much.

If my calculations are correct that thing probably has somewhere near .180 jets in it. :-k

Oh, and you didn't call tonight? I've got a ball game to go to tomorrow evening and will leave here around 5pm.

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 Post subject: Re: Running Alky
 Post Posted: Wed Sep 14, 2011 4:41 am 
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G,day,
I'll have a stab! it should be 1.5 - 2 tenths quicker and about the same in mph quicker compared to petrol.
Do you footbrake the car? if so i'd say it will definently be quicker as long as the car will still hook with the extra hit.
Ask the guys at apd about the fuel system? as Ken says it may be iffy? on my engine which is near 600hp with an apd 750 and their belt pump there was absolutely no difference on the engine dyno between the belt pump at 8.5 - 9 psi and an electric pump at 7 psi, but that may be different in the car and that was my set up.
On a cleveland engine i'd say to start with 3 - 4 degrees less timing and go from there, don't know about chevs but!
You need to try it! will be interesting!
Cheers
Paul


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 Post subject: Re: Running Alky
 Post Posted: Wed Sep 14, 2011 7:04 am 
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Hey Ken,

Sorry I didn't call, Looks like I have a broken/collapse coil spring on my car. I have the new springs on there way, but I don't think I will get them in time to make the friday test and tune. I may not be able to try it out before the bracketfinals. I will check the carb out tonight to see what jets and all are in it.

Its an APD, so I would expect it to be a half decent piece.

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 Post subject: Re: Running Alky
 Post Posted: Wed Sep 14, 2011 3:27 pm 
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Timing? My 18* SBC likes LESS timing with methanol than gas but only about 2 or so degrees less. I'd drop it a few before you start and "sneak up" on it from there until the MPH falls off. Methanol will detonate so be careful if you try to lean it out.

RE: Fuel delivery? Yeah, with a 750 he might would be OK but with 200 MORE CFM I'm not sure since he's not that far away from a Dominator flow wise and I know that they don't work with electric pumps and single N/S bowls unless a vacuum referenced regulator is used with around 10psig down track.

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 Post subject: Re: Running Alky
 Post Posted: Thu Sep 15, 2011 5:58 am 
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Quote:
I'll have a stab! it should be 1.5 - 2 tenths quicker and about the same in mph quicker compared to petrol.


Depends on the combo. My combo is that much slower on Alcohol.
Doesn't even run the same.
If You have a highly efficient combo alcohol will be slower.
In Bill's case he will probably be faster because he has 23 degree heads.
12 degree heads, 15+ compression will be slower.
Now if I knocked a few points of compression out of mine it would probably come alive on Alcohol.


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