Canadamaxxer
Pro
Posts: 1090
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posted October 20, 2004 01:03 PM
Stroker engine info or input please....
I was on the Dragbike forum and was reading about how Entropy got his crank fixed by Marine Crankshaft....that got me thinking. I have a core crank sitting here....I could send it down for stroking (it is 4.6mm to make from 1270 to 1375, right?), get some new valves and springs (I want to run a pretty big shot of nitrous) from Johnnycheese, along with gaskets and I would be good to go. I know that Muzzy's has the 1270-to-1375-kit buyer send their pistons in for fly cutting, but is there any reason why I can't install a .100 Falicon spacer instead? I have adjustable cam sprockets already, and if I ran only that spacer (and no base gasket) I should come pretty close to returning to the previous compression ratio, right(1/2 of 4.6 mm is 2.3mm or .090"....and with the base gasket in and I bet that we're at .100")? Then it's just a question of re-degreeing the cams and I should be all good, right? To do it this way would save me the trouble sending the pistons out...and the spacer and stroker crank is far cheaper than what Muzzy's wants to charge for the kit (over $1300 USD + $140-150 for machining the pistons). To do it the way I am thinking is about $1000 (give or take)USD including the valves, springs and gaskets.
Any thoughts?
  
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MadMike
Moderator
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posted October 20, 2004 03:05 PM
pay for the kit and everything matches!
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ninja12
Needs a job
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posted October 20, 2004 07:27 PM
Mike, i didn't expect you to say that.
You were one of the first to run uncut 1270 pistons with a stroker crank.
Surely it's not that hard. What type problems did you run into?
I think you may have cam chain issues.
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MadMike
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posted October 20, 2004 08:19 PM
No problems other then me putting it together wrong! the second time! this last time I had 1 1/2years, and about 400 passes out of the setup! I have really done well and won a few bucks with this kit. it has paid for itself!
Mad Mike
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ZXLNT
Needs a job
Kawpuke Extraordinare
Posts: 2853
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posted October 21, 2004 12:29 AM
Mike what broke this time???
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osti33
Needs a job
Posts: 2973
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posted October 21, 2004 03:04 AM
If you go with a .100" base spacer you may have cam chain issues...
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entropy
Moderator
Posts: 8671
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posted October 21, 2004 09:14 AM
i'm currently running an .080 base spacer + 2 x .010" base gaskets with 4.6mm crank; both the head and the block have been milled.
I agree with osti you'll have cam chain issues with OEM cct, BUT a billet cam chain tensioner should fix u up!
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MadMike
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posted October 21, 2004 11:08 AM
spun a bearing.... I have not had time to do a tear down, so it will be a month or so.
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NINJA12
Needs a job
Posts: 3310
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posted October 21, 2004 12:59 PM
Putting it together wrong.
DO i see a learning oppportunity here.
Care to Share?
quote:
No problems other then me putting it together wrong! the second time! this last time I had 1 1/2years, and about 400 passes out of the setup! I have really done well and won a few bucks with this kit. it has paid for itself!
Mad Mike
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MadMike
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posted October 21, 2004 02:36 PM
It was from the 2nd, failure, I am sure if you do a search you will see the story. but I had over tighten, my cam chain and I believe it tweeked the end of the crank and caused the outer case bearing to get trashed, and the #4 rod bearing to spin. and I actually am going to start a complete thread on the Life and times of my next motor! including everything from how many passes, dyno pulls, oil changes, oil evaluations etc... This should be a very good thread and a great tool for anyone that wants a reference for their own build.
Mad Mike
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Ra12r
Zone Head
Posts: 919
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posted October 21, 2004 08:14 PM
What about a comparative life cycle thread, in which the life and times of the motor is compared between builders. Right now we have 3 strokers that I know that are not running but being assembled. You, Entropy and me. All had bearing issues, (multiple times) and are being rebuilt because of bearing issues. So the results should be interesting, as the hardware is the same. But the life experiences will be different.
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entropy
Moderator
Posts: 8671
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posted October 21, 2004 11:18 PM
ra,
i have NOT had "bearing problems" with my stroker set ups.
I had 2 separate "no oil to the bearings" problems.
1. oil pump drive shaft parted = no oil pressure
2. oil pick up screen plugged = no oil pressure
I don't feel that either failure had anything directly to do with the stroker set up.
I do like the idea of compiling cause/effect & life cycle info as Mike and you are suggesting. I think it MIGHT help us understand what is generating problems.
Gotta be careful tho; there are many factors. I have been keeping detailed records of my set up/builds/track & dyno history for 4 years, and I am still learning cause/effect stuff daily. 
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MadMike
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posted October 22, 2004 12:14 AM
RA, Entropy, I think that is a great Idea! I am going to really dig into this and if 1 person finds some knowledge it will be worth it!
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ZXLNT
Needs a job
Kawpuke Extraordinare
Posts: 2853
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posted October 22, 2004 02:27 AM
quote:
. Right now we have 3 strokers that I know that are not running but being assembled. You, Entropy and me. [/Quote]
1 more as I am collecting parts now, my crankshaft I will be using is on it way via UPS at the moment...
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psycho1122
Pro
Posts: 1608
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posted October 22, 2004 04:16 AM
THANK YOU for making that clear entropy!!
I've seen too many misconceptions...........
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MadMike
Moderator
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posted October 22, 2004 04:24 AM
Z.. who it building your motor?
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ZXLNT
Needs a job
Kawpuke Extraordinare
Posts: 2853
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posted October 22, 2004 07:38 AM
Myself and a buddy more than likely...
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NINJA12
Needs a job
Posts: 3310
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posted October 22, 2004 11:17 AM
Don't forget to replace the rod bolts and nuts!
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Canadamaxxer
Pro
Posts: 1090
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posted October 22, 2004 12:16 PM
Sorry I missed most of this thread.....I just got home from the hospital after having ACL reconstruction done on my left knee. I'm trussed from ankle to hip and am fully medicated on Percocet.
To respond to some of the questions and statements: I will buy the kit if I have to, but tend to like the satisfaction of doing it myself, and that includes the R and D. I have a manual cam chain tensioner, and adjustable cam sprockets. I am wondering about alignment of the throttle bodies versus the openings in the frame. The engine has been built right...Carrillo Rods, Muzzy billet clutch parts, etc, etc. I am not thinking of this project for right now (obviously due to the fresh surgery), but maybe in a year or so. I had intended on buying the kit from Muzzy's....but am just enjoying the mental exercise of seeing what else is possible.
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johnnycheese
Pro
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posted October 22, 2004 05:31 PM
the one I just finish a month ago the #3 rod bearing went but that was due to the MUZZY weldup crank was never harden. Now that the crank is fixed and harden no problems even with a big shot .
I will never buy a weld up from Muzzy again
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Canadamaxxer
Pro
Posts: 1090
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posted October 22, 2004 08:33 PM
JC: Do you think the Marine crankshaft service is better than Muzzy's, or do I need to go billet?
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ninja12
Needs a job
Posts: 3310
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posted October 23, 2004 05:47 PM
johhnychesese would you recommend carillo rods for a 1270 with a 100hp shot.
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bossman12r
Zone Head
Posts: 513
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posted October 23, 2004 06:19 PM
JC, what about an APE crank?
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ninja12
Needs a job
Posts: 3310
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posted October 24, 2004 10:38 AM
IMO very good work, but usually was long lead time.
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Ra12r
Zone Head
Posts: 919
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posted October 25, 2004 09:32 AM
Marine Crankshaft includes nitriding as the NORMAL package for their cranks.
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