Reply To: qd-20 conversion to fuel pump

[need2fish]

Steve — can you tell us if you have any compression drop as a result of using the plate, and/or difference of color of top plug? (The latter may take some time to occur).

It stands to reason the charge for that cylinder will be shaped differently and may have lower density because some of the charge may have gone out through the exhaust ports. If there’s no way to measure it, the point is moot.

(if it makes no difference, why would the OMC engineers and the factory put so much expense into creating the deflectors).

I don’t have access to a milling machine, but it would be an interesting exercise to put a plate in both bypass ports. That’ll double the effect(s). Either way, measuring torque, top rpm, unburned fuel, fuel efficiency would be tough.

(insert lightbulb emoji here) . Take the bottom deflector out , turn it upside down and deflector out — just checking my Fastwin — it may fit