2.8 Dyno Day 4 Finale and Review

[Mummert]

 

[Shran]

Thanks for keeping us updated. Cool project and I have enjoyed the videos.

Interesting that the Offy intake didn’t really make much difference? I didn’t figure it would on a small engine. Did you run a Motorcraft 2bbl on it during your dymo time?

 

[Mummert]

The OFFY was going against well modified stock manifolds. The OFFY doesn't flow as much as a well ported stock manifolds with a more straight forward design. A bigger engine would make the OFFY look worse. 350 holley was the smallest carb we ran, but it was too small for this engine. 500 2 barrel picked up 14 HP in the 200HP territory.

 

[Hoosierman]

I've been watching your progress, and I wondered how close to 200hp you would get to. The little engine that could.

 

[Mummert]

Got a few other things going before I can work on stuffing it into the car. Depending on how things go I may run it again on the dyno trying to refine the combo a little better. The last carb I was working on didn't get finished. I would of liked to try an open spacer on the last manifold. Spent so much time screwing around with other things that there wasn't much time to dial in the final combo too far. The carb needs some pretty good jetting changes with spacer changes. It seems more sensitive than a V8 in that regard.
Getting the front and rear fueling right on the 390 takes a little work. In the videos you can see the float bowls were changed to monitor lbs./hr in the front and rear with separate fuel lines. The front fuels pretty heavy. They come with 52's front and rear and a power valve. Usually if you have a power valve in the primary you have 6-7 size bigger jets in the secondary to get even fuel flow. I think we ended up with 50 in the primary and 56 or 57 in the secondary to get a decent fuel flow balance.
Might pull a head and look at the burn patterns to see if I'm missing anything with the intake valve job. The pushrod adjusters are buried pretty far, might get some pushrods made that are .075" longer. The vacuum secondary could of come open a little sooner. I think there might be bit more in it. The performance overall is good, but theres always more. We'll see if the time and money is available.
Keeping it cool is certainly a priority, well see what can be done with the radiator when the time comes.

 

[85_Ranger4x4]

The OFFY was going against well modified stock manifolds. The OFFY doesn't flow as much as a well ported stock manifolds with a more straight forward design. A bigger engine would make the OFFY look worse. 350 holley was the smallest carb we ran, but it was too small for this engine. 500 2 barrel picked up 14 HP in the 200HP territory.

I ran a 500 Edelbrock on my roughly 200hp 302 and it was pretty happy so that checks out. It was nowhere near tapped out.

Keeping it cool is certainly a priority, well see what can be done with the radiator when the time comes.

Depending on what it goes into a two row 4.0 rad is a really nice possibly drop in upgrade. One from a first gen Explorer is a bolt in swap for a 83-94 Ranger. In 95 the Ranger's 4.0 rad got a lot bigger and can cool a V8 on its own.

 

[Mummert]

Its going in an MG at this point. The radiator is decent in the car but I'm thinking it will need more for the bigger engine.
I've got some things to do before I can do the swap. We'll have some time to dig into options.