Stock 1.8 head flow numbers??

warp · Post by **warp** » Fri Feb 06, 2009 3:52 am

Hi
I looking for some flow numbers from a stock 1.8L head with 41/34 valves or a stock 2.0L 914 head with 36/42 valves.

I'm doing some simulations in relation to a type 4 build but without good flow data for the heads it's not worth much. (I only have data for type1 heads)

I hope someone are willing to share? ...it's only for stock heads so no reason to keep it a secret.

/Jacob

purity · Post by **purity** » Fri Feb 06, 2009 9:49 am

I believe Jake Raby has those numbers

warp · Post by **warp** » Sun Feb 08, 2009 12:00 pm

Yes he has the numbers no doubt.
Come on, anybody willing to share??

typ4 · Post by **typ4** » Sun Feb 08, 2009 5:52 pm

I will have those in about a month, I am going to flow all stock heads and then have a 2.0 porsche ported to a good flow effort. with stock valves.

warp · Post by **warp** » Mon Feb 09, 2009 12:08 am

That sounds great, just what I'm after.

Wally · Post by **Wally** » Mon Feb 09, 2009 1:08 am

I thought 914 2.0 was about 160 on the intake at 0.500" lift.
Someone had previously done this some time ago to compare his work on 914 2.0 heads afterwards. It was posted originally on thesamba and linked here on STF.
Maybe do a search?

Clatter · Post by **Clatter** » Mon Feb 09, 2009 10:36 am

Oh, man this is something i'm after, too.
Who's got the stuff? Where it at?

Would really love to see what kind of porting works on the 2.0 head.

I have stock 1.7 and 1.8 heads,
And was getting some 2.0.

Was going to port one hole a slight bit, then another some more, then another a lot, and see.
Also curious to the I/E ratio, and to see what does what to the flow numbers...

This is a good thread, at least for modified heads...

http://www.shoptalkforums.com/viewtopic ... light=flow

dstar5000 · Post by **dstar5000** » Mon Feb 09, 2009 11:36 am

Search the Aircooled Technology forum.

What y0u seek is there....

Maybe look for HAM......

Don

HAM Inc · Post by **HAM Inc** » Tue Feb 10, 2009 2:30 pm

This is a stock 1.8
0.0500 25.5 39.2 28.00 28.00
0.1000 47.3 67.5 28.00 28.00
0.1500 64.8 85.4 28.00 28.00
0.2000 83.7 93.3 28.00 28.00
0.2500 96.6 107.5 28.00 28.00
0.3000 103.0 120.8 28.00 28.00
0.3500 105.8 133.4 28.00 28.00
0.4000 107.5 144.4 28.00 28.00
0.4500 109.3 153.6 28.00 28.00
0.5000 110.4 161.1 28.00 28.00
0.5500 111.5 165.3 28.00 28.00

This is a stock 2.0 914, though I should point out that it was a bit of an over achiever. Most of the stock 2.0 914 heads I've flowed were closer to 180CFM at .500" lift.

0.0500 34.0 25.0 28.00 28.00
0.1000 61.6 47.5 28.00 28.00
0.1500 89.8 68.1 28.00 28.00
0.2000 117.1 86.5 28.00 28.00
0.2500 133.8 101.5 28.00 28.00
0.3000 145.8 116.3 28.00 28.00
0.3500 159.4 125.9 28.00 28.00
0.4000 171.4 131.4 28.00 28.00
0.4500 180.6 134.3 28.00 28.00
0.5000 187.6 135.7 28.00 28.00
0.5500 192.4 136.8 28.00 28.00

craigvwdude · Post by **craigvwdude** » Tue Feb 10, 2009 5:48 pm

Wow, big difference between the two.

Wally · Post by **Wally** » Wed Feb 11, 2009 12:01 am

Great info Len!

i _think_ you have written intake/exhaust numbers on a different column, but its clear what should be where.

Am I correct to assume that you could theoretically get close to 200 hp from a 'good' stock 914 2.0 head from a flow perspective?

For a complete view of the flow of a type 4 head, it would be also great to have the same flow info of a stock late (say 914) 1700 head with the stock 39/33 valve arrangement

warp · Post by **warp** » Wed Feb 11, 2009 12:59 am

HAM Inc wrote:This is a stock 1.8
0.0500 25.5 39.2 28.00 28.00
0.1000 47.3 67.5 28.00 28.00
0.1500 64.8 85.4 28.00 28.00
0.2000 83.7 93.3 28.00 28.00
0.2500 96.6 107.5 28.00 28.00
0.3000 103.0 120.8 28.00 28.00
0.3500 105.8 133.4 28.00 28.00
0.4000 107.5 144.4 28.00 28.00
0.4500 109.3 153.6 28.00 28.00
0.5000 110.4 161.1 28.00 28.00
0.5500 111.5 165.3 28.00 28.00

This is a stock 2.0 914, though I should point out that it was a bit of an over achiever. Most of the stock 2.0 914 heads I've flowed were closer to 180CFM at .500" lift.

0.0500 34.0 25.0 28.00 28.00
0.1000 61.6 47.5 28.00 28.00
0.1500 89.8 68.1 28.00 28.00
0.2000 117.1 86.5 28.00 28.00
0.2500 133.8 101.5 28.00 28.00
0.3000 145.8 116.3 28.00 28.00
0.3500 159.4 125.9 28.00 28.00
0.4000 171.4 131.4 28.00 28.00
0.4500 180.6 134.3 28.00 28.00
0.5000 187.6 135.7 28.00 28.00
0.5500 192.4 136.8 28.00 28.00

Thanks just what I was looking for!

I think Wally is right, the int/ex colums have been switched in the 1.8 table.

/Jacob

HAM Inc · Post by **HAM Inc** » Wed Feb 11, 2009 7:09 am

Here's the stock 1.7 flow data.
I should point out that the 1.8 and 2.0 914 intake ports can be ported to identical specs, the 1.7 can not be brought out as far. All of the ex ports can be made identical.

It should also be noted that to maintain a I/E port flow ratio of around 75%, if I spend 10 minutes porting an ex. port on a 1.7 I will have to spend somewhere in the neighborhood of 40 minutes on the intake port. With the 1.8 that 10 minutes turns into about 25 minutes on the intake port.

0.0500 38.2 25.8 28.00 28.00
0.1000 64.4 45.9 28.00 28.00
0.1500 80.4 63.1 28.00 28.00
0.2000 98.5 77.9 28.00 28.00
0.2500 112.9 86.9 28.00 28.00
0.3000 123.6 90.9 28.00 28.00
0.3500 134.1 92.6 28.00 28.00
0.4000 143.7 94.0 28.00 28.00
0.4500 151.2 95.0 28.00 28.00
0.5000 156.5 95.8 28.00 28.00
0.5500 160.9 96.5 28.00

Class 11 streeter · Post by **Class 11 streeter** » Wed Feb 11, 2009 1:59 pm

Len, thank you for dropping by, you input is always appreciated!

Rba · Post by **Rba** » Thu Feb 12, 2009 11:12 am

Nice info Len!

Do you have flow figures for a 2 litre squareport also?