Ported top end: Port Match or bolt it on...

[LGAFF]

Results speak for themselves......I would also note Mr. Haibeck sells his porting as a bolt on...maybe he can weigh in.....again, I am not proclaiming it to be superior, just that the 36mm will flow as well as a runner that tapers down to a stock head port......

*37 rear wheel upmatched....
*Marcs average is 35
*Locobobs average is about the same and he tapers to 34


I am not an engineer, but obviously what works, works, alot of things in play here, the angle of the entry into the heads, size of runner, air speed, etc.....Peter Brock was laughed at for his Daytona Coupe design, was told it did not conform to the "rules".....guess who was right.

Theory and practical application can produce two different results...show me proof of a dramtic difference in hp and I will agree....

again, broken rcord, someone go out and port an intake to the stock head port and show the improvement of 45 or 50 rwhp.....we can talk all day about theories, but someone show a result!

Originally Posted by Schrade

Glad you decided to re-join the DISCUSSION. If MY posts were what made you call the exchange a 'PISSING MATCH', sorry.

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"if anyone wants to see dyno sheets..."

hmm... I didn't see anyone asking for proof of anything.

OTOH, I am EXTREMELY interested in exceptions to rules.

In this case, the exception is your result:

(and it doesn't need re-wording; I understand the syntax COMPLETELY).

The RULE (NOT your exception to the rule, Mr. G, but the RULE) is laminar flow into a cylinder (no, NOT the combustion chamber) beats turbulent flow into a cylinder, EVERY TIME, all factors being equal.

If in the LT5 case, there's some waveform resonance that overcomes the abrupt bore diameter change from 36mm, to 32mm (inclusive of the bevel in the head inlet), I'm listening. And I have a pretty GOOD grasp of String Theory, and String Harmonics, so fear not going over my head.