Thanks
Geoff
-- Geoffrey Merryweather
Fax (0064) 9 2360639
EMail: ge...@deepthnk.kiwi.gen.nz
"By the hammer and hand all the arts do stand"
- Motto of The Worshipful Company of Blacksmiths
If you have any further questions, please address them to me directly and
I will try to answer them for you.
Regards,
Matt Manspeaker
1993 WERA 'D' Superbike
National Champion
York, PA
Agreed. I have a fairly fresh 400 motor minus the head w/1mm over Cosworths
for sale if anyone is interested. I also have the head of my 94 HP motor but
it's in need of freshing up.
> DO NOT use the "race kit" CDI box. The stock valve springs will not take
>the extra 2000 revs for very long.
I disagree. I ran with the Kit CDI box (1WG) all last year with no problems
with the stock springs. I was also using Web cams and winding it up to 14.5K
often so the springs were getting a decent workout.
I put 10 race weekends on the motor along with 4 Willow races that were
already on it when I bought it from Curt Jordan of Jordan Engineering.
Definitely proven reliability. This is also the motor that won the expert
lightweight superbike race at the CCS season opener at Daytona this year.
I would suggest avoiding the RD springs. I had some that 1) had higher seat
pressure than stock, 2) had lowerer open pressure than stock, 3) cracked both
under use and while I was removing them from the head.
-Jim Brewer
The head off your 94 HP motor...............not a 400 right ???
I have seen a 400 motor with a block spacer and 600 pistons and rods make
80 hp , but, the only Yamaha that I have seen with that kind of grunt is
my friends FZR6 that was dyno'd @ 104+. I did get a chance to ride it @
Rockingham and some of the F# and 6R guys were really unhappy !! It spun
the rear out of almost every corner, even the fast ones.
Back to the 16k RPM... what kind of valve springs do
you run. Does simply putting in better springs enable the
motor to spin up to 16k? Is the sharp drop off in power past
14.5k due to the stock valve/spring action?
What does stiffer springs do to the
cam lobes and the shims?
Alex (AMA/CCS A215)
The guy wouldn't, perhaps, be Philip DeGregorio, would it? If so, I'm
pretty familiar with that motor.
-Jim
His first name is Phil, (don't know his last) so it's probably him.
I only had a quick chat with him at Bridgehampton
so I don't know anymore about his engine. He did mention he won
Daytona last year and I remember hearing the words "fastest 400 in
the country". With 100hp try not to be... :-) I'll probably see him this
week at Loudon...
How do you handle the valve head to cylinder clearances at 15:1?
Also, is the engine spinning past 14.5k RPM?
Alex
Probably so.
>I only had a quick chat with him at Bridgehampton so I don't know anymore
>about his engine. He did mention he won Daytona last year
At the CCS season opener in LWSB. He did this year too. Ron Perry won
the ROC at Daytona last October (with a 585cc motor that pulled me) and
I took 2nd.
>and I remember hearing the words "fastest 400 in the country". With 100hp
>try not to be... :-)
It doesn't put out 100hp .. he was pulling your tuna. It was my motor last
year and the best I got out of it was 94. I have the dyno charts (and Phil
has copies). Curt Jordan also got 94hp out of it when Dave Koskenin was
riding it with the WSMC.
>How do you handle the valve head to cylinder clearances at 15:1?
Curt could tell you. There's more in that motor than meets the eye. Curt
said the hard part was keeping the compression _down_.
>Also, is the engine spinning past 14.5k RPM?
Nope, the kit black box limits it a 14.5K. I never hit the rev limit on
it (didn't need to :-), but it would pull strong through an indicated 14K.
-Jim
Is Phil using the same carbs you were using?
>>How do you handle the valve head to cylinder clearances at 15:1?
>
> Curt could tell you. There's more in that motor than meets the eye. Curt
>said the hard part was keeping the compression _down_.
Keeping compression down?
You speak strange words to me....
Do you know how Curt Jordan could be reached ? (email)
Alex
I think so .. Keihin 33mm FCR's.
>Keeping compression down?
>You speak strange words to me....
Yeah, that's what I thought when he told me.
>Do you know how Curt Jordan could be reached ? (email)
Absolutely ... he doesn't have email, but a buddy of his reads this group
(Karl, are you there??). Curt's number in Santa Ana is (714)568-1592. He's
a great guy to talk with and has always been very helpful to me no matter
what kind of question I've had. In my experience, it's tough to find a
decent engine builder that really knows how to get power and reliability out
of a motor .. Curt is one of 'em.
If you do call him and you don't mind, tell him I refered him to you.
-Jim