How would you design a max effort street sbc?

randy331 · Post by **randy331** » Tue Jul 18, 2017 9:22 pm

CGT wrote:
randy331 wrote:I think, good heads with high DC will have an impact on the BSFC #, and high DC and less reverse flow seem to be connected, along with less low lift flow forward. Randy
Do you mean port energy?

No.

Randy

Carnut1 · Post by **Carnut1** » Tue Jul 18, 2017 9:38 pm

We can start a new thread, discharge coefficient vs. port energy.

MELWAY · Post by **MELWAY** » Tue Jul 18, 2017 10:04 pm

Some people must have very happy dynos

randy331 · Post by **randy331** » Wed Jul 19, 2017 9:07 am

Carnut1 wrote:We can start a new thread, discharge coefficient vs. port energy.

You mean what one is vs the other, or the value of one vs the other ?

Or a vote to see how many use each ?

Randy

CGT · Post by **CGT** » Wed Jul 19, 2017 9:56 am

Carnut1 wrote:We can start a new thread, discharge coefficient vs. port energy.

Good idea.

randy331 wrote:You mean what one is vs the other, or the value of one vs the other ?Or a vote to see how many use each ?Randy

All of the above.

RevTheory · Post by **RevTheory** » Wed Jul 19, 2017 10:04 am

I'm guessing they both go hand-in-hand. Good thread topic, though.

CGT · Post by **CGT** » Wed Jul 19, 2017 7:34 pm

Carnut.jpg

Carnut1 · Post by **Carnut1** » Wed Jul 19, 2017 7:38 pm

Which head is that? 60/40 valve spacing? Double check those valves your 2.02 is bigger than your 2.05 valve or at least it looks that way. Thanks, Charlie

randy331 · Post by **randy331** » Wed Jul 19, 2017 8:39 pm

The exact sizes are,
2.024
2.056
2.128
2.281

I didn't have any 2.200 valves so I used the 2.280, and I was gonna use 2.08 instead of the 2.05, but 2.05 is what I'm using in these heads, so I went with that one.

It is a Dart pro 1 200cc head. I didn't have any 215s in shop now.
I "think" the 200 has the valves moved over .030" and the 215 is 60/40 spacing, but you can get the idea what different sizes look like in that casting.

Randy

Post by **GARY C** » Wed Jul 19, 2017 8:51 pm

CGT wrote:Carnut.jpg

That should really broaden your power curve.

zums · Post by **zums** » Wed Jul 19, 2017 8:57 pm

Dose that thing come stock with a 1.84 throat??, id go with the 2.28 valve and 2.14 throat, port energy man

Tom

Carnut1 · Post by **Carnut1** » Wed Jul 19, 2017 9:11 pm

GARY C wrote:
CGT wrote:Carnut.jpg
That should really broaden your power curve.

I think I get it. It is a joke that the different sized valves will all have a different torque peak. Having multiple torque peaks flattens the torque curve. Very clever.

Carnut1 · Post by **Carnut1** » Wed Jul 19, 2017 9:12 pm

I appreciate the effort in making that pic. Interesting to look at it that way. Thanks, Charlie

Post by **GARY C** » Wed Jul 19, 2017 9:16 pm

Carnut1 wrote:
GARY C wrote:
CGT wrote:Carnut.jpg
That should really broaden your power curve.
I think I get it. It is a joke that the different sized valves will all have a different torque peak. Having multiple torque peaks flattens the torque curve. Very clever.

Yes, just being goofy.

Carnut1 · Post by **Carnut1** » Wed Jul 19, 2017 9:22 pm

zums wrote:Dose that thing come stock with a 1.84 throat??, id go with the 2.28 valve and 2.14 throat, port energy man
Tom

Hmmm, I can see that port energy is not universally accepted. That is fine. I am not here to make you a believer. I am here to learn and maybe teach others what I have learned. Think of it this way guys. Not everyone is a cylinder head pro, not everyone can go to sleep and wake up with a complete engine design by morning. Some can, Port energy can really help a non pro make way better power than the average wrench by using some measurements and a kick ass program and a bit of hard work. Thanks, Charlie

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How would you design a max effort street sbc?

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