allports

Here's a few pics of assorted manifolds,
T/P early style s/p Ported
T/P Vn style Standard and was very turbulent on the bench
Harrop Vn style standard and was smooth on the bench.

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allports

Pics of the T/P early style runners in the plenum etc

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If you plant a cucumber, you get a cucumber!
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3554me

did the vn t/p require alot of work to smooth it out up to the harrops standards ,
cheers.

those runners look like artwork , seems like alot of work

allports

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If you plant a cucumber, you get a cucumber!
Two things are infinate,the universe & human stupidity, and Im not sure about the universe.
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allports

Like they are so fkn turbulent eddys going on everywhere compared to the Harrop I wont bother till I've got nothing else to do, but when you have 25 heads to port that's one of the choices you need to make. The Harrop was smooth as silk. And without major changes in the CSA thru the runner which is going to help you at the end of the day. Fuel while suspended in Air doesnt like being squeezed or turned too much.

__________________
If you plant a cucumber, you get a cucumber!
Two things are infinate,the universe & human stupidity, and Im not sure about the universe.
Albert Einstein
Without deviation from the norm, progress is not possible. Frank Zappa

allports

T/P runner T/P runner T/P runner Harrop runner

__________________
If you plant a cucumber, you get a cucumber!
Two things are infinate,the universe & human stupidity, and Im not sure about the universe.
Albert Einstein
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pvk308

was the turbulence due to port or runner work allports or was that in the general design of the manifold. i do like the raised water water runner on the t/p manifold would be nice if it was on the harrop

allports

Eddys due to the fact that the T/P has a runner .150" smaller than the port side to side and shorter top to bottom by .210". So what happens when f/a is travelling at over 300fps with a diameter of 1.6" and then falls into an area that's over 1.8" in diameter. I'll leave all that up to you guys to decide. Remember on a gear change the engine needs to recover the momentum that is lost almost instantaniously, now throw into that the turbs created from the f/a falling sharply into a larger open area! Can someone step up to the plate here? Engine recovery is very important to the acceleration of the engine through all gear changes.

__________________
If you plant a cucumber, you get a cucumber!
Two things are infinate,the universe & human stupidity, and Im not sure about the universe.
Albert Einstein
Without deviation from the norm, progress is not possible. Frank Zappa

allports

T/P T/P plenum T/P plenum Harrop plenum

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If you plant a cucumber, you get a cucumber!
Two things are infinate,the universe & human stupidity, and Im not sure about the universe.
Albert Einstein
Without deviation from the norm, progress is not possible. Frank Zappa

3554me

no siphoning effect due to f/a falling out in a open area, loss of velocity means poor recovery

allports

Close, If you have a head that goes 100cfm and is smooth as silk, it will out run a head that goes 130cfm that has turbs in it.

__________________
If you plant a cucumber, you get a cucumber!
Two things are infinate,the universe & human stupidity, and Im not sure about the universe.
Albert Einstein
Without deviation from the norm, progress is not possible. Frank Zappa

rusty

Great pics allports.
That side by side shot of the Harrop and Torque Power, I'm not sure if it's an optical illusion or not but the runner angle seems to be different between the two.
The Harrop looks to be steeper/better.

pvk308

the more turbs you have means you will break up the air-fuel mixture more or over do the atomisation process and will slow it down getting into the combustion which mean the engine will have longer to recover due to the decreased or broken air-fuel mixture so there for would be characterised as a stumle on acclereration. the less turbs the faster the air-fuel mixture moves and better atomisation hence giving more air-fuel mixture in the combustion chamber and a better burn process and would be characterised as smooth transition through acceleration is that close or am i way off

rusty

What about air/fuel atomization being lost and raw fuel being left behind in runners and ports?

terrytappet

howdy, what about injection, no fuel seperation there.just turblant air past the valves