_2X044_
Posted 26 February 2019 - 10:21 PM
Good evening all,
Do any of you have experience with the Edelbrock RPM Air-Gap manifold for VN heads? How does the height compare to other manifolds such as the Torque-Power or Harrop manifolds. I'm looking at putting one in my LH under-bonnet.
Thanks for your help.
Peter
Forum Fixture
Posted 27 February 2019 - 09:00 AM
Hi Peter. I can't comment from experience but just checking the info on them the Torque-Power site says they make no apology that it may be tight and would need to run a drop filter and wouldn't fit if you need to run a spacer. They don't say what car they are referring to here and I can't find any dimensions. Edelbrock say there manifold is 5.31 inches at the centre (5.82" at the rear). Harrop say their manifold is 120mm (4.72") from block face to carby face. I intend running a Harrop duel plane and I believe (hope) it will fit under the bonnet but tight. Cheers Ron
_rollo_
Posted 27 February 2019 - 12:27 PM
idd love to know too what 'real' HP u can make as in 480-500hp
Lotsa Posts!
Posted 28 February 2019 - 11:11 AM
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_2X044_
Posted 28 February 2019 - 03:23 PM
Thanks everyone. I think I'm leaning towards the Torque Power low rise dual plane manifold, looking at Rexy's information though I'd suspect the significantly cheaper Edelbrock would fit.
I guess manifolds don't go bad, it'd better to run the manifold that best suits the current combination, sell it and buy a new manifold with a new combination and only be out of pocket $200 rather than buying the manifold for the "one day" motor and having a doughy turd in the meantime.
Opinions?
Lotsa Posts!
Posted 28 February 2019 - 07:16 PM
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Forum Fixture
Posted 01 March 2019 - 08:44 PM
Edited by Lima31, 01 March 2019 - 08:45 PM.
_2X044_
Posted 05 March 2019 - 10:19 PM
Thanks everyone. For a number of different reasons I pulled the trigger and ordered the TP low rise manifold. I'll let you know how it goes.
_2X044_
Posted 16 March 2019 - 08:57 PM
The Torque-Power low rise dual plane turned up this week. The casting looks good, for a low rise manifold it seems tall.
I measured up the manifold and got 142mm at the back of the carb mounting surface and 130 at the front.
Add the carb and it is 222mm at the back.
Forum Fan
Posted 18 March 2019 - 01:03 PM
Very hard to get an accurate idea if the bonnet will make contact. I've been down this road. Too many variables. EG The back of the engine sits lower than the front, H series engine mounts lower the engine 8mm compared to Torana mounts and the bonnet slopes down towards the front of the car. Carby, carby spacer and air cleaner also make a difference. So...... build the engine with what you have. Then try to make it all fit by changing engine mounts and air cleaner options. EG Drop base air cleaner, 2" high element instead of 3". 12" diameter instead of 14", etc. I found that the front of the air cleaner is where you are going to have the least clearance.
I have Yella Terra -3 heads which have high rise ports and inlet manifold spacers.
TP high rise DP manifold.
Half inch carby spacer
Holley 750 DP carby
Drop base 14" x 3" air cleaner with a half inch ring to clear the choke, etc.
H series engine mounts
Reverse cowl scoop
Clearance is about 12mm to the scoop from the air cleaner. Ideally I'd like to use a flat base air cleaner and delete the half inch ring, but suspect I won't have clearance.
Cheers, Steve.
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