How not to build a flow bench...

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Originally Posted by Rob@Backyardracing

so are there any part numbers on the heads to identify which head is which? i couldnt seem to find any...


but then again, i suppose in terms of a stock motor, stock CR etc, either of the heads will make the same hp anyway (within ~5hp) would they? or is it a case of some have better heads, but milder maps or cams, hence still make 166hp or whatever it is

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There are plenty of numbers, but not sure what they all mean. The best I can offer is that PH1 has the large oval exhaust port, and later heads seem to have a date etched on the inlet face below and between the 1st and 2nd ports (from the cambelt end).

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Originally Posted by andyrg

i have a F4RT Head with a cracked port if that will help with any of this development ;)

Andy

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I guess that depends upon how interested anyone is, at the moment I have enough to get on with for a while yet. Don't chuck it away just yet..

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Originally Posted by Andrew Cooke

Jesus no, it took me long enough to get rid of it last time :laugh:

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:laugh: :disagree:

I've started making the bits up to let me test the F4R head. First job bore out a bit of the blue block to 82.7mm
http://i567.photobucket.com/albums/s...g?t=1285422749

It's all about the precision :laugh:
This is my best guess for where the bead bolts should be relative to the bore
http://i567.photobucket.com/albums/s...g?t=1285422749

Oh, and I dismantled a head
http://i567.photobucket.com/albums/s...g?t=1285422749

a full set of S shaped valves, cheers Ant :D

a few more bits whilst I'm having a coffee...

I finished the blue block, drilled and tapped some holes so I could fit some M10 studs and made some dowels to hold the head in the right place relative to the bore.
http://i567.photobucket.com/albums/s...g?t=1285440301

The head is held down with 4 nuts
http://i567.photobucket.com/albums/s...g?t=1285440301

I've started on something to open the valves
http://i567.photobucket.com/albums/s...g?t=1285440301

all being well I'll get that finished and do some tests later tonight. :)

all done:

and just for fun, a comparison between GTT, Gordini, and 172 heads :cool:

http://i567.photobucket.com/albums/s...g?t=1285447184

you got a b18ft head you could test to see how it stacks up against the c1j head just out of curiosity:D

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Originally Posted by SCHWARTZ

you got a b18ft head you could test to see how it stacks up against the c1j head just out of curiosity:D

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Sorry, I'm clean out of heads now :)

I'd guess that it's close to the Gordini head, although the bigger bore may help a bit.

New poster! (less than 10 posts)

It Would be nice to see a B18ft cam against other heads :)