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OK Borrowed a mates 750 DP ready for this weeks street meet now......Did notice that motor sounds a lot crispyer & more responsive.

I 'll let you know the reasults Thursday.

Cheers Oz
 
I will be very surprised if you see much of an improvement. Many people forget that a dual plane splits the carb in half, so on a single plane you have the 750 feeding each cylinder, same carb on a dual plane you've got a 375 cfm carb in effect. We've found in Dyno testing that a basic 360 that makes peak power at 6400-6500 RPM will use up a 825 Demon or 850 DP Holley with a 2" open spacer.
We're hoping to try a Dominator on a friends 318 stroker with an Air Gap & Edelbrock heads, from memory he has a 950HP on it now.
 
Ok ran the wagon with the borrowed 750 DP but didn't have time to sort it ran same as with 750 Vac.

anyway I have purchased a 850 HP ultamate & 2" open spacer will be tuned in the next week or so & we'll see what happens. Also found a Mopar M1 intake at the right price so I got that waiting if we need it.

Cheers Oz
 
la360 said:
I will be very surprised if you see much of an improvement. Many people forget that a dual plane splits the carb in half, so on a single plane you have the 750 feeding each cylinder, same carb on a dual plane you've got a 375 cfm carb in effect. We've found in Dyno testing that a basic 360 that makes peak power at 6400-6500 RPM will use up a 825 Demon or 850 DP Holley with a 2" open spacer.
We're hoping to try a Dominator on a friends 318 stroker with an Air Gap & Edelbrock heads, from memory he has a 950HP on it now.
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Hi La360

I hear what you are saying & in makes sence we'll see what happens in the next week or 2 with the new changes.

Cheers Oz
 
Oz, You have lots of torque but I'm afraid you may not have the head to turn much more RPM I have a similar combo in a bit lighter car and am turning about 6500 @ 130+ with a 29x10 maybe a taller tire is in order. I am also running 3.91 gears.
 
1 fst Dart said:
Oz, You have lots of torque but I'm afraid you may not have the head to turn much more RPM I have a similar combo in a bit lighter car and am turning about 6500 @ 130+ with a 29x10 maybe a taller tire is in order. I am also running 3.91 gears.
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Sounds very similar set up I do think I need a taller tire......add that to shopping list
 
1 fst Dart said:
If you're turning 6400 /116 you may want to look into converter slip
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Yes...

That set up is turning the DS about 5800-5900. It's slipping in the 10% range, good to some, sloppy to others... me included.
 
Ok guy's while I'm wait for my M1 to be machined I am going to run the RPM airgap with 2" open spacer & new 850 HP carb. For this weeks meeting....Then by the next meeting I should have the M1 on it will be interesting to see the difference between the 2.

Cheers Oz
 
bOb shingler said:
toss the air gap and go to that m1 you found. dual planes are not for racing. they are a street intake and work good if you're not after horse power.
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Manifold selection is combo dependent....blanket statements like this are usually just plain wrong.

Like I said in an earlier post, I've run 10.89 with an Air-gap intake (with a 1.5 inch spacer)....I switched to a Victor and I'm still running 10.8 with a little more MPH, but a slower 60'.

With the cam you have, you are right there on the edge where a single plane would probably help more than it would hurt...but you should see what your car likes (try it and see)....but I don't see the intake holding it back much, if any.
 
Update......The wife ran the long roof yesterday her first run 11.5 @ 115.4mph 2nd run 11.45 @116.7mph 3rd run fuel issues looks like it's time for an electric fuel pump.

She had a good day racing till the engine fan let a blade go ended up in the battery & acid everywhere.

This week will see a new electric water pump & fan fitted as well as electric fuel pump & battery relocated to the back of the wagon.

Cheers Oz
 
la360 said:


Which intake were you running at the Mopar Rumble?
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We ran a RPM airgap with 2" open spacer at the Rumble....We had a few issues either not enough fuel or timing haven't had a chance to play with it since the Rumble. I should have left it alone at the test & tune 2 weeks before the Rumble we were running 11:2's @ 117MPH then I changed the jets & had the dizzy locked out before the Rumble.

I have a M1 to go on it & a set of Eddy heads just finding time at this time of year is the hardest thing.

Here's a pic from the Test & Tune day it gets out the hole ok for stock rear springs, no snubber & street shocks 60's at high 1.5's to1.6 sec only stalling to 2000.

Cheers Gra
 

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