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Sportster Motorcycle Motor - Top End Discuss Sportster Motorcycle Top End issues. Rockerboxes, Valves, Cylinders, Pistons, Rings, Lift Rods, etc...

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  #21  
Old 29th January 2019
twistediron twistediron is offline
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Sportster/Buell Model: 883 hugger
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i was hoping my jaws would be long enough to grab up near the ring grooves but each jaw move independently anyways so probably wont be a big deal as long as the face is square
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  #22  
Old 29th January 2019
t120r t120r is offline
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Sportster/Buell Model: xl883r
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t120r is a jewel in the rought120r is a jewel in the rought120r is a jewel in the rought120r is a jewel in the rought120r is a jewel in the rought120r is a jewel in the rought120r is a jewel in the rought120r is a jewel in the rought120r is a jewel in the rought120r is a jewel in the rought120r is a jewel in the rough
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Originally Posted by twistediron View Post
not milling because i own a lathe not a mill and the cams are stock 883 cams
This setup DID run on pump gas (Supreme at the pump is 93 here), the 883 cams will need VERY fine tuning or it will detonate the hell out of this combo. You need a later intake valve closing cam. I first used the Edelbrock cam which had 42ABDC. I tuned the VOES with a new spring and used a wideband to watch AFRs. I spent countless hours setting it up. Very hard riding or a hot day would make it ping from a stop. Ordinary riding was pretty good. I switch to the SE536s, with a 50ABDC and it was a different animal altogether. Rarely ever pinged. In fact I was happy with it and would have kept the combo as is except I went mental and ordered a 90ci kit.

The pistons are forged JE. Should be able to lop the tops off. The pistons have a thermal barrier coating applied by Fireball performance. Would be a shame to remove it. A clean and polish of the chamber wouldn't hurt. The Singh grooves in the chamber probably attributed to the detonation resistance.

The most important part of this whole deal is NOT to use thicker gaskets to drop compression. You need to set the proper quench with base & head gaskets to get about 0.040" quench. That's where I had it. If you don't set a proper quench, no amount of tuning will get it running right. Even if you turn the pistons on a lathe to decrease the dome, the bike will still ping with a bad quench height. Take the time to do it right and you'll have fun with this.
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  #23  
Old 29th January 2019
t120r t120r is offline
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Originally Posted by twistediron View Post
i was hoping my jaws would be long enough to grab up near the ring grooves but each jaw move independently anyways so probably wont be a big deal as long as the face is square
You need a mag dial indicator to set that 4 jaw chuck.

I just opened up all my files from that kit. If you lop off the dome only, it will net you 9.8:1 compression. Take off 5cc (approx. half) and you'll be at 10.5:1 or a tad higher.
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  #24  
Old 29th January 2019
twistediron twistediron is offline
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Quote:
Originally Posted by t120r View Post
You need a mag dial indicator to set that 4 jaw chuck.

I just opened up all my files from that kit. If you lop off the dome only, it will net you 9.8:1 compression. Take off 5cc (approx. half) and you'll be at 10.5:1 or a tad higher.
yes thats what i was thinking was still going to run the numbers to be sure. as far as a dial indicator i have one wont be an issue. and the cams yes i want those 536 cams
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  #25  
Old 30th January 2019
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bustert bustert is offline
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you do know that you can use the lathe and not have to spin the piston. do not know what lathe you have but the piston can be fixtured to the cross slide and a facing cutter in the spindle. i do this on my lathe to make bridges and nuts for guitars. i run a spindle/live ctr with spaced multi-cutter wheels and crank in the piece. i use the cross slide to measure depth of cut.
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  #26  
Old 30th January 2019
t120r t120r is offline
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Originally Posted by twistediron View Post
yes thats what i was thinking was still going to run the numbers to be sure. as far as a dial indicator i have one wont be an issue. and the cams yes i want those 536 cams
I'm pretty sure I'm keeping the 536s. If i do sell them, I'll be selling as a package with my NRHS adjustable pushrods and Zippers collapsable pushrod tubes... so I won't be letting them go cheap. Probably $500cad for the lot.
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  #27  
Old 30th January 2019
t120r t120r is offline
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Originally Posted by twistediron View Post
yes thats what i was thinking was still going to run the numbers to be sure. as far as a dial indicator i have one wont be an issue. and the cams yes i want those 536 cams
I can help you machine to pistons if you want on my lathe. We can use my tears as coolant,
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  #28  
Old 30th January 2019
twistediron twistediron is offline
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I can help you machine to pistons if you want on my lathe. We can use my tears as coolant,
hahaha ill let you know thanks
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