Oddball engines and prototypes

[J.A.W.]

Off the top of my head but as I said I am no Yamaha guy

Well, I s'pose yours aint a 5 valve head either, then.. l.o.l...

Ferrari used them too, dunno if they still do..

[husaberg]

Well, I s'pose yours aint a 5 valve head either, then.. l.o.l...

Ferrari used them too, dunno if they still do..

Clever timing with the pun about heads.
The later 4AGE Toyotas (I think you had them in Aussie in the sprinters) did to, a bit more affordable and easier to park to boot.

[J.A.W.]

Clever timing with the pun about heads.
The later 4AGE Toyotas (I think you had them in Aussie in the sprinters) did to, a bit more affordable and easier to park to boot.

Dunno about that.. a Fazza can bloody park anywhere.. like magic..

Funny story.. the other day, I heard what I took to be.. a raucous, huckery ol' Z1 with an open 4-into-1.. coming down the street..

It turned out to be a late model rag-top Ferrari V8 with the flat-plane crank & exhaust flapper.. loud as.. dunno how they pass rego..

[husaberg]

Dunno about that.. a Fazza can bloody park anywhere.. like magic..

Funny story.. the other day, I heard what I took to be.. a raucous, huckery ol' Z1 with an open 4-into-1.. coming down the street..

It turned out to be a late model rag-top Ferrari V8 with the flat-plane crank & exhaust flapper.. loud as.. dunno how they pass rego..

it has a flapper and they don't rev their nuts off for the noise test...........

[J.A.W.]

it has a flapper and they don't rev their nuts off for the noise test...........

It would - if I was bloody testing it..

[Grumph]

They gave up on it for real stuff a few years ago, they held onto it longer than they should have, corporate pride I think

Persevered for 20 years...till they could abandon it without losing face.

Have you still got the cameron stuff about 5V ? i'm assuming an analysis of the FZR ? I've never seen it and if you were quoting him re compression and burning, he got it wrong IMO...I've built quite a few of the bastards and have my own ideas about what's wrong with the layout.

A lot of the early Yamaha 2V stuff is very Toyota in the port layout. Inlets too big and ex too small. The 5V suffers from the same imbalance.

[husaberg]

Persevered for 20 years...till they could abandon it without losing face.

Have you still got the cameron stuff about 5V ? i'm assuming an analysis of the FZR ? I've never seen it and if you were quoting him re compression and burning, he got it wrong IMO...I've built quite a few of the bastards and have my own ideas about what's wrong with the layout.

A lot of the early Yamaha 2V stuff is very Toyota in the port layout. Inlets too big and ex too small. The 5V suffers from the same imbalance.

I have it somewhere think its a bit water damaged but I think I know where it is (or was anyway.)
They had a slave engine single donk the 7 valve was better but only just.
I think I have one with just the stiuff on the FZR as well.
I always like the three layer Yamaha head though.
it was def in Cycleworld anyway.
Can't beat Cameron or Jennings for detail.

[J.A.W.]

Cameron is considered, worthy IMO.. Jennings.. nah.. a tad - passe`

[Grumph]

I have it somewhere think its a bit water damaged but I think I know where it is (or was anyway.)
They had a slave engine single donk the 7 valve was better but only just.
I think I have one with just the stiuff on the FZR as well.
I always like the three layer Yamaha head though.
it was def in Cycleworld anyway.
Can't beat Cameron or Jennings for detail.

Slave engine single....are you talking the Britten single ? Kelford made a fortune off that, after every short dyno run, cams and followers had to be redone.

First example of the 3 layer head i know of is the Offy - but that was probably copied off a Miller anyway. Harry was pretty clever.

[husaberg]

Cameron is considered, worthy IMO.. Jennings.. nah.. a tad - passe`

hes been dead for long time so I am not that surprised you find him passe.........

[husaberg]

Slave engine single....are you talking the Britten single ? Kelford made a fortune off that, after every short dyno run, cams and followers had to be redone.

First example of the 3 layer head i know of is the Offy - but that was probably copied off a Miller anyway. Harry was pretty clever.

No Yamaha had one there was photos of it in the article.
They had rigged it up f=with 5 and 4 and 7 valve heads for testing (I guess even Yamaha has a budget lol)
I never seen the single was it a horizontal?

[J.A.W.]

True, but the classics still stand up.. ( "on the shoulders of giants")

Jennings ( I find) - a bit too opinionated/prescriptive.. & wrong..

[Grumph]

No Yamaha had one there was photos of it in the article.
They had rigged it up f=with 5 and 4 and 7 valve heads for testing (I guess even Yamaha has a budget lol)
I never seen the single was it a horizontal?

I never saw it either but it was described to me in "colourful" terms....it did lay down and die in the end though.
I have no idea if any bits survive but given the hate for it I've heard, I'd doubt it.

[husaberg]

I never saw it either but it was described to me in "colourful" terms....it did lay down and die in the end though.
I have no idea if any bits survive but given the hate for it I've heard, I'd doubt it.

So it was a tits up engine configuration
I will see if I can find it after league tomorrow.

[J.A.W.]

Persevered for 20 years...till they could abandon it without losing face.

Have you still got the cameron stuff about 5V ? i'm assuming an analysis of the FZR ? I've never seen it and if you were quoting him re compression and burning, he got it wrong IMO...I've built quite a few of the bastards and have my own ideas about what's wrong with the layout.

A lot of the early Yamaha 2V stuff is very Toyota in the port layout. Inlets too big and ex too small. The 5V suffers from the same imbalance.

Sure, but Yam went proddy 4V ( TX 500) in the early `70s - 'bout the same time as Honda did ( XL 2/350).. so what was the 5V really about?

Big noting.. or TBO valve clearance-wise..