Decided to practice porting and polishing engine parts. Tell me how I did.
12-03-2014, 10:53 AM
#16
Also, thanks for mentioning this, because you just jogged my memory that the piston skirt is cut wider on one side than the other side, and I never realized why until now. I don't remember which way I installed it, so I'll check that when I get home.
Last edited by fyrstormer; 12-03-2014 at 11:21 AM.
12-03-2014, 11:18 AM
#17
Look through te photo's at this page:
https://www.facebook.com/mag.tunedengines?fref=ts
He does a lot of modding to pistons.
https://www.facebook.com/mag.tunedengines?fref=ts
He does a lot of modding to pistons.
12-03-2014, 07:28 PM
#19
Ran the engine again. It seemed to rev-up a little more readily, but that could just be because of the cold dense air. I never got the engine above 212F, I kept leaning it out bit by bit and it just never warmed up all the way, though I didn't try leaning it out until it gagged on hard acceleration, so I didn't lean it out *too* much. I probably need to buy a baby-sock and put it over the heatsink so it'll warm up faster.
In any event, it didn't explode, and that's what I was really worried about.
In any event, it didn't explode, and that's what I was really worried about.
12-04-2014, 01:48 PM
#20
Tech Initiate
Generally you do not want to be touching the outside of the sleeve as it will reduce the seal between that and the crankcase.
Changing the actual port timing will achieve more than polishing or making cuts in the sleeve.
Often just changing the crank timing will give you a performance increase and that is very easy to modify.
Most important is to measure what you have before modifications.
Changing the actual port timing will achieve more than polishing or making cuts in the sleeve.
Often just changing the crank timing will give you a performance increase and that is very easy to modify.
Most important is to measure what you have before modifications.
12-04-2014, 06:42 PM
#21
I made sure not to make any cuts that intersected the parts of the sleeve that touch the crankcase.
The crankshaft might benefit from some modification, but I can't find a good guide for that. The only part I can figure out just by looking at pictures is filling the end of the crankshaft with silicone to smooth the flow of intake air, and maybe polishing the inside of the crankshaft for the same reason. The crankshaft already has a "turbo scoop" cut into it, though, and all of the edges were clean from the factory, so I doubt there's much I can do to improve the crankshaft at this point.
The crankshaft might benefit from some modification, but I can't find a good guide for that. The only part I can figure out just by looking at pictures is filling the end of the crankshaft with silicone to smooth the flow of intake air, and maybe polishing the inside of the crankshaft for the same reason. The crankshaft already has a "turbo scoop" cut into it, though, and all of the edges were clean from the factory, so I doubt there's much I can do to improve the crankshaft at this point.
12-05-2014, 07:33 AM
#22
I made sure not to make any cuts that intersected the parts of the sleeve that touch the crankcase.
The crankshaft might benefit from some modification, but I can't find a good guide for that. The only part I can figure out just by looking at pictures is filling the end of the crankshaft with silicone to smooth the flow of intake air, and maybe polishing the inside of the crankshaft for the same reason. The crankshaft already has a "turbo scoop" cut into it, though, and all of the edges were clean from the factory, so I doubt there's much I can do to improve the crankshaft at this point.
The crankshaft might benefit from some modification, but I can't find a good guide for that. The only part I can figure out just by looking at pictures is filling the end of the crankshaft with silicone to smooth the flow of intake air, and maybe polishing the inside of the crankshaft for the same reason. The crankshaft already has a "turbo scoop" cut into it, though, and all of the edges were clean from the factory, so I doubt there's much I can do to improve the crankshaft at this point.
12-07-2014, 09:29 PM
#24
Finally got the chance to do a few speed runs with the modified engine. It seems to spool-up better, though I can't tell if the top speed has changed. I was fine with the previous top speed, though, so that's fine.
35,000rpm sure sounds pretty with a tuned pipe.
35,000rpm sure sounds pretty with a tuned pipe.
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
