23 replies to this topic

[speedster]

Anybody in the UK providing a similar kit?

 

http://www.flowperfo...com/system.html

 

 

[fezzasus]

Dyson, vax?

 

Can't the same be made with a MAF?

[speedster]

Dunno? It's the cylinder bore adapter plate which I believe needs high tolerances (my tooling won't hack it). Then there's the electronics and software.

[fezzasus]

Other approach is to try and get time on one, I imagine most automotive engineering university departments have one which you could access.

[speedster]

good idea and must check the uni where I work.... my schedule means doing a little bits of this at a time though 

[Nev]

Are you thinking of grinding + polishing your own head? Seems like a lot of expense and effort to set up for maybe 1% to 3% gain. Also there is the risk that you actually end up making your head worse (with the cost implication). I thought about something similar for my car 5 years ago, but in the end thought the results would be better from a pro, as there I felt that experience counted more towards to this black art.

 

 

 

Edited by Nev, 02 January 2015 - 02:06 PM.

[speedster]

Yup! Going to diy. Finding somebody with experience in my neck of the woods is a real challenge. Probably talking about a pro shop with a long waiting list + huge expense. I have a used z22se head to work on before I tackle my new Saab head. Would be hoping for more than 2℅ with a forged engine running oversized valves, uprated springs, some wild cams, increase CR, itbs, etc. Obviously the easy way is to bolt on a supercharger but I prefer to stay na.

[speedster]

Probably skip oversizing the valves and keep the standard Saab ones

Edited by speedster, 02 January 2015 - 03:13 PM.

[Nev]

Best talk to Vocky then, NA BHP increases are hard won on that engine by all accounts. Supercharing it to stage 1 would be cheaper, faster and less work I would imagine.

[speedster]

AFAIK 250+ has been achieved... If I got that with good torque... plenty for me

[speedster]

Been reading some of vocky's work over on z23se.org

[speedster]

Z22se even

[oakmere]

If staying NA I would change the valves to wasted stem even if not going oversized. I used 1mm over sized wasted stem valves and when they cut the seats they also opened up the valve throat by 1mm to match. I used the z22se head but part of me wishes I had used the Saab.

[speedster]

Yeah... I like the 1mm oversize option may junk the sodium cooled stems in the head at the moment. who did your head work oakmere?

[oakmere]

I did the port and polish and a company called the headshop did the valve seats, stems and spring seats (for the Schrick cams).

[speedster]

Got a link? A search bringing up every head shop on the planet! what power curve did the schrick cams give?

[slindborg]

I should probably have a crack at making a flow bench with the access we have to electronics and software thesedays... I learnt on an old superflow and it was amazing fun and insightful. The bore hasn't got to be hyper accurate and you can simply do it with a few layers of mdf with an hole in each to act as the spacer. For modding you don't need accurate absolute numbers but you need accurate repeatability and results comparison so you can see what you've done etc.

[speedster]

good point about accurate repeatability Is the internal structure of the saab b207 head the same as the zz2se cylinder head? Water channels etc.

[oakmere]

http://www.head-shop-uk.co.uk The Schrick cams are very good for a road car with the stock or 2.4l inlet manifold, giving a good even spread of power and torque. To produce 250bhp with ITB's I would be looking at stage 3 comp cams or similar spec from another supplier.

[TheHood]

I'm making 214BHP at 7500RPM on schrick cams with ported head and ITB's (when the fukcer runs that is..) torque curve kicks in at about the same point as on 2.4 mani, but is maintained much better to the red line.