New Revmaster DG063 10 fins cylinder heads

[modok]

14 per hour, you forgot a zero

If the world was fair, but we always knew it isn't
But I'll do anything once, just to see, and I guess that's why I'm barely scraping by, but very few regrets.

[Brian_e]

$140/hr would probably make my hands feel better the morning after.

I really like building heads. I am always learning something new, and they are interesting. Building spring plates, IRS kits, and disk brake kits are the opposite, but I can actually make a living building suspension and brake parts. The suspension side buys me more tools for the non-profitable heads and engine side.

Brian
_________________
So more or less the lazier and stupider you want to be, the nicer quality parts you need to buy.
-Modok


www.type-emotorsports.com

Type E Engine Parts and Supplies
https://type-emotorsports.com/collections/engine-parts

[94touring]

Wonder how practical it would be to come up with some sort of porting template (tutorial?) to sell so I can be cussing at heads and manifolds after 30 hours of grinding.

[58 Plastic Tub]

What Brian needs is a $250,000- $500,000 multi-axis CNC mill.

Then, once he's got his ports and chambers "just so" by hand, he can do a 3D scan of them and start churning them out by the hundred load. Then the market can complain that CNC heads by a guy in SD are "ridiculously overpriced" at $1500 a set. The payback will be measured in decades, if not centuries.

In keeping with the way things are done these days, we should start a GoFundMe page for him and harangue people to donate. The fund should top out at about $126, before we all peder out.
_________________
Stan Galat
"A single point in isolation is a reference point. Two points is a line. Three points is a trend. Trends don't lie."

[Alexander_Monday]

[94touring]

Yeah, I've got templates in my shop I've used to port rotary engines, which got me thinking why not for something like this situation. Brian's already put out great info on correcting panchitos. I'd really like these heads for a specific build I'm working on, but they won't do me any good unless I get the flow numbers and ratios correctly done.

[chrisflstf]

[58 Plastic Tub]

[Brian_e]

Link


Brian
_________________
So more or less the lazier and stupider you want to be, the nicer quality parts you need to buy.
-Modok


www.type-emotorsports.com

Type E Engine Parts and Supplies
https://type-emotorsports.com/collections/engine-parts

[Schepp]

Haas makes some "affordable" 5th-axis trunnion rotary attachments. Used starting at $10k. Depending on the size.
Might be able to fit a head on a TR210.

[Dave]

[Alstrup]

Well, yeah, Brian is right with the point that flow numbers are only 30% of the tale. So even though it can be a good read, a head flow comparison is not really much more than that. If you do not know at least the port volume of a given head you can´t really assume much. I myself focussed too much on flow numbers for many years. That got me in trouble a couple of times with engines not performing anywhere near what they were supposed to. Today, when "we" have much better tools and much more general knowledge we also look into avr port velocity and port denity energy and also where/how the fuel mix is distributed in the combustion chamber.
Then we need to decide,
which rpm band do we want the engine to work in.
What displacement.
Which induction system do we want.

Then when the moment of truth comes and the engine (hopefully) is put on a dyno or chassis dyno we can (again, - hopefully) rely on the dyno being properly calibrated after DIN, SAE60 or SAE 1349J corrections. Then we have a chance to know what that given combo actually does. If we could get that far the average home builder, and even us semi pro´s, would have a much greater chance of selecting the parts which suits his or her expectations.
Also, in almost any case except drag racing the focus should be more on APB compared to peak hp. - That said, the 2 hang together to a certain extent, but still. For instance, Back in 2018 (Before the world got on edge) I helped setting up a Porsche 993 for compeeting in the Moscow 500 You are only allowed to do so much in the stock class, but it is possible to find a little here and there and also to move the power around a bit. In the final tune we were 10-11 hp away from the highest peak pulls, but the car was 0,23 seconds FASTER on the 500m. That solely came from more torque in the midrange so the engine picked up better after gearshifts.

Anyway, back to this subject. - If you want to compare cylinderheads, you need more data than just flow numbers. BUT! Here is a little giveaway, which I believe Brian has also touched somewhere. If you compare flow numbers on 2 sets of heads you should pay attention to how well the heads flow BELOW 0,400" lift and ABOVE 0,400" as 2 separate comparisons. If one cylinderhead flows better below 400 thousands and still hangs on fair above, that head will 95% of the time perform better in a street configuration.
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https://www.thesamba.com/vw/forum/viewtopic.php?t=435993

[Victor H]

I think a shorter version of what you are saying is you want the "highest average area under the curve." This would be true for both flow and velocity, if you can optimize both.

[Brian_e]

[94touring]

You happen to have any ft/sec numbers to other street heads to show as a comparison to these 063s?

[Brian_e]

[Victor H]

One other advantage of high port velocity you didn't mention. The higher the port velocity the better the mixture and turbulence in the combustion chamber and the lower the risk of detonation for any given load/rpm/ throttle opening (again, within reason).

[94touring]

Tims really blasting air in there. Thanks for posting these. My backup plan I was leaning towards cb ultra mag, but this changes my mind a bit since I too am doing a 2300+ cc good bus motor/boring bug motor.

[Brian_e]

Those Tims S1 heads are kinda crazy. I had Greg do them with a smaller port volume on purpose. Those are the fastest airspeed heads I have had on my bench. I have used S1 heads on other engines and they always work fantastic.

If I was building another 2300+ bus engine, I think it would get Tims S2 heads with about a 72-73cc port volume, and something similar to a web 163.

Brian
_________________
So more or less the lazier and stupider you want to be, the nicer quality parts you need to buy.
-Modok


www.type-emotorsports.com

Type E Engine Parts and Supplies
https://type-emotorsports.com/collections/engine-parts

[94touring]

You read my mind on the stage 2 Tims since he list them with 73 port volume, plus I've already committed to a w163.