Sunday, July 17, 2011

Reed block photos

Well mainly in response to a comment by "2TRaceLab" a couple of posts back, I have included some additional pictures of the reed blocks.
The standard fibre reeds measure 0.55mm thick. The carbon fibre V-Force reeds measure 0.50mm thick.

Note that on the Lower RH side, the gas mixture flows through the crankshaft. The last picture shows the crankcase has deflectors immediately downstream of the reeds to help direct flow in between the crank wheels.
On the Upper LH side, the gas mixture flows towards the crankshaft and then up into the transfer ports.
The 3rd to last picture shows that immediately after the reeds, the crankcase has a small deflector at the bottom of the intake path directing airflow up.

I have no idea if there are any real significant differences here.
However, for the Upper LH side, it seems to me that having no reed petal backstops will help flow into the transfers where I have flowed the case. Other than that, I suspect that there is probably not much in it.
Of course the V-force reeds have 4 petals per reed as opposed to the standard reed blocks 2 petals per reed.
I leave it up to the reader to draw whatever conclusions they can. Back to back Dyno tests are the only real way to get answers I suspect.



V-Force and standard reed blocks with no stuffers or petals

Standard reed block with stuffer blu-tacked in place

V-Force reed block with flowed stuffer

Downstream of reeds. Upper LH side with crank

Upstream of reeds. Upper LH side with crank.

Downstream of reeds. Lower RH side with crank.

Upstream of reeds. Lower RH side with crank

1 comment:

  1. Thanks for your post, quite helpful and detailed.
    I really like the 4th picture. The flow to the LH cylinder seems more physical than stock, with no abrupt angles for the mixture to get it's way to the transfers. Keep on! Nick

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