Classic Cars mag KDU487n

[Bobbieslandy]

Hi all,

there's a piece in the mag about KDU487N and it mentions the works V8's had 4 valve cylinder heads, is this true?

Thanks

[busheytrader]

That's the first I've heard of that. I'm no expert but the RV8 is an ohv design and how would you adapt that to work 4 valves per cylinder?

[Cobber]

That's the first I've heard of that. I'm no expert but the RV8 is an ohv design and how would you adapt that to work 4 valves per cylinder?

In theory it would be possible to have 4 valve heads operated by pushrods, but it would be too bloody complicated to be worth the effort!

Of course you could possibly fit Repco overhead cam heads, good luck finding any of them!

[moestr7v8]

Hi Bobby
I agree with Cobber on this, but I must say I have never heard of that one either though, what magazine was the the article in?
Cheers
Moe

[Hasbeen]

Nothing to do with the topic really, but the Repco Formula 1 championship winning engine based on the Rover/Buick block was an interesting beast. I have never seen another like it.

It was a single overhead cam, with no combustion chamber in the head. The valve seat inserts were level with the bottom face of the cylinder head, & the entire combustion chamber was formed in the piston. When you put the head down, face down on a bench, it was sitting on the valve heads.

My first thought was that it made for a heavy piston, & a lot of reciprocating weight. That it was redlined at 9700 RPM in the 2.5L version did tend to disprove this. Then I got the Brabham airborne over the second hump down Conrod straight Bathurst, [where the chase is today], & flew 180 yards, pulling 11700 RPM while in the air according to the tell tail needle. The thing did not bat an eye, & went on to win the race the next day, proving that they could handle the weight no problem.

Hasbeen

[Cobber]

It was a single overhead cam, with no combustion chamber in the head. The valve seat inserts were level with the bottom face of the cylinder head, & the entire combustion chamber was formed in the piston. When you put the head down, face down on a bench, it was sitting on the valve heads.
Hasbeen

Jaguar V12s (pre HE) used this set up.

[Bobbieslandy]

Hiya, it's in this months 'Classic cars' there's a small feature on the rally car in there. I have never heard of this either, that's why it kinda stuck out like a sore thumb in the article. It was one of those moments where you thought you'd read everything about it and whallop, huge piece of info which I'd never heard of.