some results with my flow bench

[PatAllen]

So i started to play with my new toy.

I got some interesting results.

I tested a stock e21 2.0 head and it showed 202cfm at .5" so it is a bit optimistic, but at .1" it shows 63cfm which is dead on.

My slightly ported head shows 216cfm, which is already good.

The interesting part is when i bolt up a stock intake manifold hoged out for a 32/36:

e21 2.0: 178cfm

ported e12: 194cfm

After i hoged out the intake manifold runners to match the ports, it showed NO improvements on the ported head and almost none on the stock head...i concluded it is because the intake is much more restrictive than the head, and to show any improvements it would need to have the runners opened up thru the carb, which is almost impossible unles you use the extrudehone process.

So, i am not saying matching the runners is a waste of time, but...

Now i need to port the head more to increse flow at low lift...and fix the valve angles...

[conkitchen]

I like that you even went the distance to paint the box.

Also like the catch can.

[Harv]

Good work Pat.

Have you read David Vizard's Tuning the A series engine? Lots of good info there about porting theory.

John

[PatAllen]

I like that you even went the distance to paint the box.

Also like the catch can.

lol...i think i will prtin the pbr logo and stick it on...funny.

[PatAllen]

Good work Pat.

Have you read David Vizard's Tuning the A series engine? Lots of good info there about porting theory.

John

not at all, but i bought Harold Betes new book...i even talked with him.

i didnt found the book you refer to but he is releasing soon a nice one, and also a picture of the one i bought.

[1453aalapapa]

another interesting read is bob cousimano's d port. i visited his shop years ago, and he had done this on a local guy's 2002, and the result was remarkable. there also was a couple nascar heads being made out of billet aluminum. he also had 100mm jugs for porsche 911.

[slash02]

not at all, but i bought Harold Betes new book...i even talked with him.

i didnt found the book you refer to but he is releasing soon a nice one, and also a picture of the one i bought.

I just bought that engine airflow book. A great read. Must have been fun talking with Harold.

[aa/fd]

Any time you get to work with Harold can be a life changing experience. Our association started in the 70's when he was at MSD, continued thru his tenure at SuperFlow now to his own Power Technology Consultants. His knowledge and experience are priceless, plus a great sense of humor.

[Harv]

Pat, that book I'm referring to is specifically for the A series engines found in Spridgets and Mini's. Anything I spew out of my mouth as knowledge, I learned from Vizard's books.

John

[PatAllen]

Pat, that book I'm referring to is specifically for the A series engines found in Spridgets and Mini's. Anything I spew out of my mouth as knowledge, I learned from Vizard's books.

John

lol, for one second i thought you refered to the Ford model "A"...i said wtf he would like me to look at a book about a 8hp 6:1 cr engine flat twin with side valves...?

lol...

[allbim]

Nice work Pat. I wonder if a Canon manifold would flow better. I have never seen one in person and wonder if the runners are bigger.

[PatAllen]

Nice work Pat. I wonder if a Canon manifold would flow better. I have never seen one in person and wonder if the runners are bigger.

i was wondering the same thing....i HOPE it flows more otherwise i dont see the reason of its existence...

is it true Cannon is no longer in business ? i try to find the company or details about it...IE seems to sell one, thats the only info i found.

[allbim]

Pat, since the stock intake manifold seems to restrict airflow in a big way, it would be interesting to know if there is any significant difference in flow #'s between the 32/36 and the 38/38 Weber.

[PatAllen]

Pat, since the stock intake manifold seems to restrict airflow in a big way, it would be interesting to know if there is any significant difference in flow #'s between the 32/36 and the 38/38 Weber.

yes there is.

(not my data but MM ones)

Stock dbbl___________205cfm

weber32/36__________265cfm

weber38____________295cfm

weber40(not dcoe)____335cfm

note that my actual flow numbers are for 1 port (around 194cfm)

[allbim]

Pat, since the stock intake manifold seems to restrict airflow in a big way, it would be interesting to know if there is any significant difference in flow #'s between the 32/36 and the 38/38 Weber.

yes there is.

(not my data but MM ones)

Stock dbbl___________205cfm

weber32/36__________265cfm

weber38____________295cfm

weber40(not dcoe)____335cfm

note that my actual flow numbers are for 1 port (around 194cfm)

Interesting, thanks.