B2 Motorsports - Jeff Lipton 487 FE Build

[blykins]

I'm not paying for this engine....

Patrick, Wiseco is old-school. I don't care what Claire says.....

[lippy]

I think you all know the saying about being in the game vs. being in the stands. As far as I'm concerned Brent is in the game and most of us are in the stands. That's why no one would pay me to build an engine.

[ERA Chas]

Actually Mahles.....

[blykins]

I do love me some Mahle pistons. Use them in a lot of builds.

[ERA Chas]

Originally Posted by blykins

I do love me some Mahle pistons. Use them in a lot of builds.

Are they still coming with coating?

[blykins]

Sure are...

[RodKnock]

Originally Posted by ERA Chas

Actually Mahles.....

Chas knows what he's talking about. Popular with the Porsche crowd.

Wiseco's? Puh-leeze. This coming from a guy who installed a Centerforce clutch in his ERA.

[Dimis]

Lippy - Word of Warning:

DO NOT tell your wife or girlfriend that you're getting DIAMONDS for this little engine of yours.
She'll forever hold it against you, the price Brent quoted for your build wont be but a drop in the ocean trying to appease her there after.

[patrickt]

Originally Posted by Dimis

Lippy - Word of Warning:

DO NOT tell your wife or girlfriend that you're getting DIAMONDS for this little engine of yours.
She'll forever hold it against you, the price Brent quoted for your build wont be but a drop in the ocean trying to appease her there after.

Hmmm, did you know that occasionally Victorian toshers would find diamonds? For some reason this thread made me think of that little fact....

[lippy]

Originally Posted by Dimis

Lippy - Word of Warning:

DO NOT tell your wife or girlfriend that you're getting DIAMONDS for this little engine of yours.
She'll forever hold it against you, the price Brent quoted for your build wont be but a drop in the ocean trying to appease her there after.

If I have to get my wife some jewelry every time I get a car, I'm glad to make that trade. At least I know up front what I'm getting into.

[blykins]

Your heads and Anthony's heads came in yesterday from Pond. Unfinished seats. As soon as the valve job is done and they're milled, I'll post pics and flow numbers.

[lippy]

Originally Posted by blykins

Your heads and Anthony's heads came in yesterday from Pond. Unfinished seats. As soon as the valve job is done and they're milled, I'll post pics and flow numbers.

Sweet. How does the porting look? I hope to see some big flow numbers.

[blykins]

They are CNC ported and they look great. The exhaust ports have a different design than the edelbrocks, but they supposedly perform better too.

Flow numbers are a big part of it, but they don't tell about velocity, which is extremely important too. These will do just fine though.

[lippy]

Originally Posted by blykins

Flow numbers are a big part of it, but they don't tell about velocity, which is extremely important too. These will do just fine though.

If flow is volume per unit of time, and velocity is distance per unit of time, then velocity is flow divided by area. Since the area of a port is constant, I would think flow and velocity should be proportional, aside from variation of flow across the area. Is this incorrect?

[blykins]

Port area isnt constant....

But think of it this way: air and fuel has momentum. It takes time to get it moving. Guys that port their stuff at home have a tendency to hog the ports out as big as they can, thinking a big port makes more power. In reality, a smaller port that flows the same as a big port will most likely perform better because the velocity of the charge will be higher and you can shove more in with respect to time.

Perfect scenario is a port that flows a lot, but is efficient enough to have high velocity as well.

[Chilibit]

I was with you right up until the last phrase:

"and you can shove more in with respect to time."

Does this not violate the "flows the same" premise?

I agree with the 'perfect scenario.'

Originally Posted by blykins

Port area isnt constant....

But think of it this way: air and fuel has momentum. It takes time to get it moving. Guys that port their stuff at home have a tendency to hog the ports out as big as they can, thinking a big port makes more power. In reality, a smaller port that flows the same as a big port will most likely perform better because the velocity of the charge will be higher and you can shove more in with respect to time.

Perfect scenario is a port that flows a lot, but is efficient enough to have high velocity as well.

[blykins]

I'm not the best at explaining things...

Let me try it this way...

You can have an excellent flowing head that performs like doo-doo. You can have a poorer flowing head (read lower numbers) with excellent velocity that performs awesomely.

The reason is because the application varies from case to case and since we're speaking of street engines here that require great throttle response and operate at "sane" rpm levels, you want a head that has higher velocity so that it's easier to make an amount of air/fuel move.

[lippy]

I meant that port area is fixed over time, not at different elevations in the port. If two ports flow the same and one has a smaller cross section, then velocity will be higher across that port, like in a venturi. It seems to me that flow and velocity need to be proportional.

But I think i get what you are explaining. Similar to an intake runner, the "natural frequency" of the flow can be optimized for a particular operating range. So some ports that flow well won't work well on a specific engine.

[blykins]

Yes sir you are correct. A head that performs well on a bench may not perform in the car, and there is a difference between velocity on that bench and velocity induced by the engine. I think that's where we were comparing apples to tangerines. My reply while sitting in the drive thru at the bank didn't help much...hahaha

[FWB]

ok now 6 pages of post and no damn pics of the engine.....WTF