4-valve v's 2-valve heads

[edo]

According to my tape measure you are wrong

[Sturmovik]

Also the VK56 is the same weight as an LS1 with gearbox attached.

[edo]

yes, when considering it in the boat it was a major plus that it was a bit lighter than a big block

[TK]

... I know how to get something more like 120% cylinder filling, and my heads also have useful swirl.

I kept it basic Bill, of course you can get more than 100% cylinder fill, you can do that just as easily with a 2V head - easier at low rpm in fact, due to higher velocity in the smaller 2V port giving better inertial ramming.
Usefull swirl that is still less than the swirl from a decent 2V head.

Your heads Bill?, or your mates heads that you're claiming are yours?

Your 'secrets' are not that special, any top line competition engine builder could do the same, if not better.

[perthdrivers.txt]

You need to do some more research if you think only two manufacturers make Pushrod engines.

ok theres the Chrysler (Viper) V10, thats three...

[Billzilla]

No Tony, you're just bend outa shape because you think I'm having a go at you. I'm not, I've just got different knowledge to you.
We both know a lot of stuff - some extra stuff I know and you don't, and vice-versa.
And yes I DO know some things that even very good engine builders don't know. I used to teach aerodynamics, and know a few little tricks that help a bit here and there. There's some things I've done that have worked well that I've never seen on any other engine.

[matlennon]

When you say you taught aerodynamics, im assuming your qualified to? What sort of education have you had on the topic?

[edo]

You dont have to be qualified at anything other than teaching in order to teach something.

Bill flys em planes...when you gets um flying licence you gots to study the winged bits

[Billzilla]

CASA approved flying instructor.

[TK]

Bill, you launched a direct personal attack on me & my ability as an engine builder, you did so because you could not disprove some of the key points of my arguments, so you chose instead to try to discredit the source.
That is a poor effort, I have every right to be pissed with you.

I assume that your failure to confirm that you actually do your own headwork means that, in fact, you don't.

Aerodynamics is not the be all & end all of porting, there are many 'tricks' that would go against basic aerodynamic theory that in fact yeild decent power gains (not necessarily flow).
I too have studied aerodynamics - a couple of years of fluid dynamics at uni has given me a pretty good idea on airflow, that combined with about 12 years of head porting experience means that I can usually produce quite a good port job, regardless of whether it is a head I am familiar with or not - of course I do better with heads that I have more experience with.

[Billzilla]

Get over it Tony.
I'll say it again - You no doubt know some tricks that I don't, and vice-versa.

No I don't port my own heads - I design them and get someone with a lot better hand than me to do it exactly how I want it.
So what.

[Sturmovik]

ok theres the Chrysler (Viper) V10, thats three...

Mitsubishi, Toyota, Volkswagen, Nissan, Cummins (4valve pushrod engines) Cat...

[Andrew Bolt]

This reminds me of the "smuggla/pentavalver" days.

What happened to him and his 6 speed AE93?

[Greg Rust]

Tk: Valve
Bill: Piston

Kiss and make up!!

[perthdrivers.txt]

Mitsubishi, Toyota, Volkswagen, Nissan, Cummins (4valve pushrod engines) Cat...

Examples?

Because afaik Toyota havnt made a pushrod engine since the "hemi" 5V more than a decade ago

And note we're talking about production passenger vehicles not commercial/industrial ones