Author Topic: 2016 Pumpkin seed build...  (Read 78322 times)

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Online KXDINO

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Re: 2016 Pumpkin seed build...
« Reply #375 on: November 29, 2019, 12:02:35 PM »
Which bike was better , or did you have to put 1 teeth larger rear sprocket for mxa crew to like it.

Offline motorman455

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Re: 2016 Pumpkin seed build...
« Reply #376 on: January 06, 2020, 02:20:09 PM »
I just got the Feb issue of MXA and the review of both bikes is there! 72h.p. out of the KX500! Sounds like Sandblaster had some trick work done to the power valves. His bike blew the base gasket early on. Must have been from all that pressure from the forced induction crank  :-D

Online KXDINO

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Re: 2016 Pumpkin seed build...
« Reply #377 on: January 06, 2020, 09:14:30 PM »
old jody would of been hanging on for he life.

Offline sandblaster

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Re: 2016 Pumpkin seed build...
« Reply #378 on: January 07, 2020, 03:55:24 AM »
I just got the Feb issue of MXA and the review of both bikes is there! 72h.p. out of the KX500! Sounds like Sandblaster had some trick work done to the power valves. His bike blew the base gasket early on. Must have been from all that pressure from the forced induction crank  :-D

Lol... Yeah it was quite the freak out that is for sure... All these Industry big wigs standing around joking and asking if we could do their top end next  :-o
The compression wasn't much, approx 14:1 but the reason it went is because it pulled a few head studs and blew the head gasket.
That happens sometimes when you are using 20+ year old cylinders  :-D
Thankfully we had a backup cylinder on hand.
Because it's a conversion bike removing and replacing the top end isn't as easy as it is on a KX500.
But we pulled the other cylinder off, pulled mine off, swapped them and Jason even fixed the front flat tire all in about 45 minutes.
It's amazing how fast you can spin a wrench when you have people standing around jeering  :-D :-D :-D
The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline motorman455

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Re: 2016 Pumpkin seed build...
« Reply #379 on: January 07, 2020, 12:20:19 PM »
So was the backup cylinder ported to the same specs by T Morgan as well? Are you able to post the dyno data and and other details behind what it took to get that kinda power besides 14:1, port timing changes and the induction crank?

Offline sandblaster

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Re: 2016 Pumpkin seed build...
« Reply #380 on: January 07, 2020, 04:12:36 PM »
Tom Morgan bored my cylinder and machined some material from the bottom for me.
He did not do any porting.
All the porting was done by Jason Tanner and I.
I roughed in the cylinder and valves.
Jason pimped and polished them up.

The back up cylinder was done completely by Jason Tanner.

Because we have other projects that are relying on the data we are developing I can't release any more data at this point.
I would love to but sometimes you just gotta keep your info to yourself until it is no longer relevant  :-D
I don't know how MXA came up with our dyno numbers but someone slipped and it was not me  :lol:
But in reality it is only a number lol.

I will say this.
This engine is a work in progress.
Even if I gave you all the specs you would have a VERY difficult time duplicating it.
Jason and I probably have close to a 100 hours or more just redesigning the valves.
The Induction Crank completely changes everything that has been done in the past.

We are working very hard to further enhance what we have done and get the most bang for the buck... Cost analysis.
I have a new cylinder ready to go for testing.
I just need to find the time to sit down and get it ready for the dyno.
We have a great starting place...
Now we need to refine until we are happy.
So, stay tuned.
The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline sandblaster

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Re: 2016 Pumpkin seed build...
« Reply #381 on: January 08, 2020, 02:11:27 PM »
Wham!!!!
Gotta like that!

The four stroke engine: That's one stroke for producing power and three for wearing the engine out.