DIY Super Accurate Flowbench

[FlowSpecialist]

Originally Posted by Randy W.

Hello flow specialist:
I find your posts very helpful. Was wondering if u had an e- mail address where we could converse on a one to one basis.
I find your posts and replies very helpful.
Interested in hearing from you.
Regards
Randy

Hi Randy,

I'm sorry but my spare time is really limited at the moment so I'll answer anything I can on the forum as time allows but I can't do one to one. I'd never get any work done.

regards

Dave

[rrrobert]

my lash up.

[MilesTugoh]

Dave,
Sorry I missed your reply. Yes, I have been known to be a cheeky fu***r from time to time mixed with genuine confusion ..

Miles

[tommurphy73]

I am intrigued by this flow bench and the one in David Vizards technical article. Do you have any photos of the finished bench? I am especially interested in the sharp edged orifice plate and how this was implemented. Why is this designed to flow only half the maximum flow of the cylinder head? How is this orifice moved out of the flow when actually measuring the fow in a cylinder head?

I am also interested in the fact that you have done a lot of work on the 2.0L pinto cylinder head. I am involved in a historic class rallying here in Ireland where the 2.0l pinto is still going strong and is still competitive in the 2.0L 8V class. Any information on porting and modifying this engine would be appreciated(maybe I should should start a new thread) I have read the bible regarding this engine written by the wizard himself and little which has been written in recent years has been able to surpass this.

Best Regards
Tom

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[FlowSpecialist]

Originally Posted by tommurphy73

I am intrigued by this flow bench and the one in David Vizards technical article. Do you have any photos of the finished bench? I am especially interested in the sharp edged orifice plate and how this was implemented. Why is this designed to flow only half the maximum flow of the cylinder head? How is this orifice moved out of the flow when actually measuring the fow in a cylinder head?

I think you need to read my post again, draw out the bench as I describe it and hopefully you'll then see how it works. The orifice doesn't move out of the way or the bench wouldn't work. It references the flow through the test piece.

I am also interested in the fact that you have done a lot of work on the 2.0L pinto cylinder head. I am involved in a historic class rallying here in Ireland where the 2.0l pinto is still going strong and is still competitive in the 2.0L 8V class. Any information on porting and modifying this engine would be appreciated(maybe I should should start a new thread) I have read the bible regarding this engine written by the wizard himself and little which has been written in recent years has been able to surpass this.

The Pinto needs bigger inlet valves and smaller exhaust ones than the 44.5/38.1 that the aged and balding scribe you refer to used in his book. 46/36 is the usual size I use in ultimate engines without moving the valve guide centres which means you keep the OE exhaust and I make my own 46mm inlets. You can actually still squeeze a bit more exhaust in there with a 46mm inlet but the risk of cracking the head between the valves increases.

Port shapes are probably more critical on a Pinto than any other head I've worked on. A few thou here and there can make or lose 10 bhp. You need a flowbench.

Dave

[tommurphy73]

Appreciate your prompt answer. I have already read your post twice but will read it again (and again) to see how it all works.

Out of interest what sort of power/torque were you getting from the 2.0L

Best Regards
Tom




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[rookie]

Tom if you are looking for plans or parts hears the place to go
PTS Flowbench Technology Flowbench Plans

[FlowSpecialist]

Originally Posted by tommurphy73

Appreciate your prompt answer. I have already read your post twice but will read it again (and again) to see how it all works.

Out of interest what sort of power/torque were you getting from the 2.0L

Best Regards
Tom

I've never been asked to build an ultimate bhp only engine that actually went on an engine dyno to reveal an answer to your question. I've done rally spec, hotrod with single carbs, fast road, 46/36 heads but not with ultimate carburation and god knows what else but never everything perfect for bhp in the one engine or that went on an engine dyno. I trust rolling road power figures about as far as I can spit a rat.

Probably the closest to an answer was a rally spec head I did for an engine that already had a proven Cossy 2.0 bottom end, DCOEs and an Emerald Phase 5 race cam. The head was already a ported 44.5/38.1 and my job was to port it properly and make it right. That put out 168 bhp at the wheels on a rolling road. Make of that what you will but I never saw the bottom end or cam or had any chance to perfect it all.

A 45.7/36 head I once did went onto a rally spec engine on an engine dyno with a Kent rally cam of some description (RL32 I think) but the owner wanted to build his own bottom end to save money. The bottom end blew up four times before they'd completed the dyno tests and the closest I got to an answer from the dyno operator was "it was showing very close to 200 bhp before it blew up last time." They did finally go to a "professional" for a bottom end, although not me, but that blew up too. After that I lost contact with the story.

If someone ever did come to me with enough money to build a no holds barred engine to beat the ones old baldy talked about in his book I'm sure I'd give him a run for his money. Especially as I know more about head flow than he does {ducks and covers}

He's such a bad loser though he'd probably go and blag titanium valves, springs and get everything ceramic coated free of charge from his contacts and all the other stuff I can't afford just to try and beat me.

Dave

[FlowSpecialist]

Originally Posted by tommurphy73

I have read the bible regarding this engine written by the wizard himself and little which has been written in recent years has been able to surpass this.

Best Regards
Tom

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If you still have the book I'd be interested in the inlet flow figures Dave achieved from non-filled ports and filled ports. It's been nearly 20 years since I did flow development on the Pinto and I was never very happy with the results. I can get as much flow out of a 42mm valve in a downdraft CVH head as I could with a 45.7mm one in a Pinto. The abrupt Pinto shortside really hurts what you can achieve with it. Good high lift flow if you cut the shortside right back but then the mid range between 250 thou and 400 thou starts to suffer.

Valve shape is crucial too. The tulip shaped valves everyone and his dog makes are useless. You want as close to penny on a stick as you can get with a Pinto.

Dave

[sir yun]

Hi the system as described is pretty much like the one pictured here:

EZ Flow System (affordable cylinder head flow bench kit, electronics, and software program)

main difference being that it uses DIY water manometers instead of electronics.