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My winter project is to fit the Holley I bought from Stagdad. I have bought the adaptor but it seems very restrictive. I am considering modifing my spare manifold to remove this restriction. Any thoughts on pros and cons of doing this?
Already done by Monarch. They remove the restrictor and weld in a Holley/Weber adaptor plate giving a much wider aperture. Not cheap though, however definitelt worth it for high end power/airflow.
Will most likely look like the attached picture of mine before modification.
I ground out the restrictions so the half moons became full half moons, plus I increased the diameter of the adapter plate to match the inlet manifold around the O ring area.
Okay maybe not as good as a fully modified welded inlet manifold but better than just bolting on the adapter plate without matching to the inlet manifold.
Thank you both for your replies. I have looked at the Monarch manifold, that my be the ideal but expensive route. As I have the bits I may play.
By improving the gas flow at high revs will I compromise performance at normal rev range? I have a ZF 4 speed so revs under 3k unless I push it in the gears.
Will the restriction in the adaptor add turbulence to the mixture, which I believe is a good thing to have?
I'll be interested to see how you get on with the modification and how it compares to the adapter plate. I suspect there will be little noticeable difference at 'normal' speeds, as the throttle will be restricting airflow far more than the plate or manifold.
If, however you get a good improvement in performance I may be tempted to follow suit.
ZF 4 spd box, Datsun shafts, SS exhaust, 38DGMS weber 158.9bhp, BMW MC Tomcat seatssigpic
By improving the gas flow at high revs will I compromise performance at normal rev range? I have a ZF 4 speed so revs under 3k unless I push it in the gears.
Will the restriction in the adaptor add turbulence to the mixture, which I believe is a good thing to have?
John.
Improving gas flow by minimising restrictions anywhere in the inlet tract will only improve things, itwill not reduce torque in the normal rev range.Unless you fully polish out everything you will have enough 'turbulence' to ensure a good fuel/air mix.
.
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