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Old 02-04-2008, 03:22 PM   #101
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Nope, keep it coming there bro. The silent majority is watching your thread with great interest.

+1 - I'd wager not a lot of the people on this forum have actually seen the inner parts/workings of a motorcycle engine.

Plasti-gauge has been around for a loooooong time - I first used it when building a 289 c.i. Ford V-8 back in 1973. It is actually a pretty accurate measurement tool and lots of engines have been built using it.

That 25 lb-ft of torque on the rod bolts sounds awful low to me too.

Did you have the crank, pistons and rods all professionally balanced?

You porting and polishing the head while everything is apart or was that already done?
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Old 02-04-2008, 03:26 PM   #102
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how does just sanding the top of the pistons help? does it just make the pressure that much more uniform over the top of the pistons and elimnate hot spots?
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Old 02-04-2008, 03:38 PM   #103
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Nope, keep it coming there bro. The silent majority is watching your thread with great interest.

+1 - I'd wager not a lot of the people on this forum have actually seen the inner parts/workings of a motorcycle engine.

Plasti-gauge has been around for a loooooong time - I first used it when building a 289 c.i. Ford V-8 back in 1973. It is actually a pretty accurate measurement tool and lots of engines have been built using it.

That 25 lb-ft of torque on the rod bolts sounds awful low to me too.

Did you have the crank, pistons and rods all professionally balanced?

You porting and polishing the head while everything is apart or was that already done?
The pistons and rods both came balanced to a half a gram and I got the certs. for em. The crank was not balanced, I just had the journals lightly polished. The stock cranks are good for 600+hp. As for the head, its at Port Tech getting all the damage repaired. Basically rewelding the bridges between all the exhaust valves, replace two valve seats and valves, SERDI valve job and vacuum test the valve sealing with the flow bench. Then they are surfacing the deck to get it true. They are also re-shimming the valves for me since they are cutting the seats. Lastly new oil seals and reinstall my Carpenter Racing valve springs. I was going to do the head myself but the seats were too bad.
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Old 02-04-2008, 03:48 PM   #104
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how does just sanding the top of the pistons help? does it just make the pressure that much more uniform over the top of the pistons and elimnate hot spots?
Well the pics don't show it that well but these pistons have VERY sharp edges all the way around the valve pockets. Those edges become very bad hot spots under high load and can contribute to pre-ignition and detontation. Not to mention those are the first areas to melt off of the pistons and get pumped around or adhere to other parts. JE recommends this prep work, especially for turbo/nitrous applications. Its very daunting to say the least. BTW I might recruit you to come help me stab the motor back in after its done....
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Old 02-04-2008, 03:50 PM   #105
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Well the pics don't show it that well but these pistons have VERY sharp edges all the way around the valve pockets. Those edges become very bad hot spots under high load and can contribute to pre-ignition and detontation. Not to mention those are the first areas to melt off of the pistons and get pumped around or adhere to other parts. JE recommends this prep work, especially for turbo/nitrous applications. Its very daunting to say the least. BTW I might recruit you to come help me stab the motor back in after its done....
yeah, let me know if you need some help
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Old 02-04-2008, 03:55 PM   #106
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yeah, let me know if you need some help
Yeah only about 10-15 mins, just to lift it up and stab it in there, throw the bolts in it, thats it. I got it out by myself but putting it in is a lot harder, it has to be "finessed" in there. Plus with my knee jacked up...even harder.

Probably will still be another 2 weekends before its ready. I am gonna start filing the rings and installing them ont he pistons tonight, I MIGHT try to put the cylinder and studs in also.....Thats a major PITA.
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Old 02-04-2008, 08:20 PM   #107
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Keep this thread rolling. I love this kind of stuff.
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Old 02-04-2008, 09:33 PM   #108
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Let me know if you need a hand bro.....I should be free and you helped me drop mine..........
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Old 02-04-2008, 10:09 PM   #109
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Let me know if you need a hand bro.....I should be free and you helped me drop mine..........
Thanks bro.....If I can't get Brett over here when I get ready, I will hit you up.

More progress:
File fitting the rings and installing them and 4 studs in the block, getting ready for the spacer and cylinder install, probably tomorrow night.....
Pistons....the other white meat???
Pistons....the other white meat???
Pistons....the other white meat???
Pistons....the other white meat???
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Old 02-04-2008, 10:31 PM   #110
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alan; pardon the noob question, but do you have to use four piston spring compressors or is the block tapered to put the pistons in?

I work on cars, so I hadn't had the luxury of disassembling my bikes yet...
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Old 02-04-2008, 10:32 PM   #111
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Looks good bro, I,ve got alot of interest in this build I,m wanting to do a stage 1 or 2 Velocity set up, its all about time and money, allways seem to be a little short on both, keep up the good work its gonna be awesome, lots of satisfaction in doing these urself, plus look at the experience, and money ur saving
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Old 02-04-2008, 10:40 PM   #112
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Bottom of the sleeves are tapered,and you only do two at a time
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Old 02-05-2008, 07:16 AM   #113
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alan; pardon the noob question, but do you have to use four piston spring compressors or is the block tapered to put the pistons in?

I work on cars, so I hadn't had the luxury of disassembling my bikes yet...
The bottom of the cylinders are slightly tapered but....you pretty much just use your hands/fingers to compress the rings and get them started in the cylinder, 2 pistons at a time. Once the top two pistons are in (#1/4) then you turn the motor over slowly as you push the cylinder down some towards the 2/3 pistons. Then fight the rings in the cylinders on those two.

Its a total pain in the and usually results in a signficant amount of blood loss out of at least 3 fingers...not to mention the tools you have to retrieve out of the walls that you hurled in a fit of rage......Normally its about a solid hour to do this and requires many tries....
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Old 02-05-2008, 07:48 AM   #114
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Alan,
This is your soon to be down the street neighbor. And I'm always game to help others with there mechanic work, just give a yell. Next time I see you out I'll drop you my cell#. The work is looking great. How much filing did you have to do on the rings?
Todd
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Old 02-05-2008, 09:32 AM   #115
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Im reading every one. Keep postin
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Old 02-05-2008, 02:22 PM   #116
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Alan,
This is your soon to be down the street neighbor. And I'm always game to help others with there mechanic work, just give a yell. Next time I see you out I'll drop you my cell#. The work is looking great. How much filing did you have to do on the rings?
Todd

Hey whats up Todd?? Yeah stop by if you see me out and shoot the and drink a beer...... oh and I had to take about .002 off of the top rings to get them to .014, the 2nd rings were at .018 which is more then enough.
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Old 02-05-2008, 09:16 PM   #117
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"Houston, we have a problem"

I might have a deck height problem...

Pistons....the other white meat???

Pistons....the other white meat???

Pistons....the other white meat???

Pistons....the other white meat???

Pistons....the other white meat???

Pistons....the other white meat???

I might have to space it out some.... .008 is the minimum I can have, I am measuring .014 without even using the right caliper and without anything torqued down.... This might be sucking..
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Old 02-05-2008, 09:31 PM   #118
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ouch... too thin of a base gasket?
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Old 02-05-2008, 09:40 PM   #119
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ouch... too thin of a base gasket?
Actually I am not even running one, I have a .080 block spacer down there....I might have to add a base gasket or two... I think I really have about .005 on the tightest piston. #4 is a little tighter then the others for some reason. I am getting opinions from the pros on this one.


These JE pistons have much taller crowns then the stock pistons.
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Old 02-08-2008, 04:40 AM   #120
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Definately keep up the posting, its a VERY interesting read.
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