Increasing comp ratio

[Marshy]

Stevem should chime in here.....
He rebuilt his motor using wiseco pistons (much cheaper than stock ones), and had lots of hp, until it went bang on the main straight.

I'm not a fan of modding motors on track bikes, as they run 100% of their use at 10-tenths. Having a modded car motor, say, and you only floor it for a few seconds once in a while, it's not very highly stressed. Unlike a track bike.

If you've got deep pockets and are willing to rebuild it frequently as a preventive measure, go for it.

Also, have a look inside first. I was sure that a motor that dropped a valve at idle would be relatively fine inside, but the bores were very slightly damaged and it turned out not being worth fixing.


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[stevem]

Stevem should chime in here.....
He rebuilt his motor using wiseco pistons (much cheaper than stock ones), and had lots of hp, until it went bang on the main straight.

I'm not a fan of modding motors on track bikes, as they run 100% of their use at 10-tenths. Having a modded car motor, say, and you only floor it for a few seconds once in a while, it's not very highly stressed. Unlike a track bike.

If you've got deep pockets and are willing to rebuild it frequently as a preventive measure, go for it.

Also, have a look inside first. I was sure that a motor that dropped a valve at idle would be relatively fine inside, but the bores were very slightly damaged and it turned out not being worth fixing.


Sent from my iPhone using Tapatalk

Mine went bang because a std BMW conrod bolt backed its was out. Apparently it was a common problem at one point with the beemer. I replaced it with a stock motor but even then it was pulled down and nicer bolts put in that were installed by measuring the stretch rather than torque. Hi comp pistons will give it more jump of the turns but personally I would leave it stock.

[BoB]

Mine went bang because a std BMW conrod bolt backed its was out. Apparently it was a common problem at one point with the beemer. I replaced it with a stock motor but even then it was pulled down and nicer bolts put in that were installed by measuring the stretch rather than torque. Hi comp pistons will give it more jump of the turns but personally I would leave it stock.

With the 600rr it recommended all new bolts and torque setting for the conrod bolts. How do you measure stretch instead of torque?