Author Topic: esr pv cylinder break in? (Read 4501 times)

jfwyatt1 · « **on:** August 13, 2014, 08:20:25 PM »

is there anything different i should know with the pv cylinder as opposed to a non pv? never had 1 before

udontknowme · « **Reply #1 on:** August 13, 2014, 09:41:10 PM »

normally within 10min i let it rip :cool:

disclaimer : take extreme caution when following anything i do

Tbone07 · « **Reply #2 on:** August 13, 2014, 09:48:48 PM »

No differences in break-in procedure. I do about 4-5 10 minute heat cycles. 2-3 10 minute slow riding sessions at no more than 1/2 throttle. Then let her rip.

You also can't go wrong with Duncan's break-in procedure. Although most will say it's a little much, better safe than sorry.

http://www.duncanracing.com/TechCenter/2stkenginebreakin.pdf

Pumashine · « **Reply #3 on:** August 13, 2014, 11:52:46 PM »

Quote from: Tbone07;40873

You also can't go wrong with Duncan's break-in procedure. Although most will say it's a little much, better safe than sorry.

That is for sure! PV makes no difference on how you break it in. Just to be safe I never go over 3/4 throttle on the first tank of gas. I have fried many a piston going to heavy on the throttle the first day. Always a complete tank just messing around. Relax and enjoy your new bore!

udontknowme · « **Reply #4 on:** August 14, 2014, 12:02:43 AM »

Quote from: Pumashine;40887

I have fried many a piston going to heavy on the throttle the first day.

do you happen to be using amsoil ? :congratulatory:

PORTED R · « **Reply #5 on:** August 14, 2014, 05:58:37 AM »

Honestly I really haven't done "proper" break ins
I got my motor back from nate ,started it up a few times ,checked for leaks ,went 300 foot racing next day
I recently pulled the head ,everything is super clean and lubed and great compression

rablack21 · « **Reply #6 on:** August 14, 2014, 08:34:16 AM »

Quote from: Tbone07;40873

No differences in break-in procedure. I do about 4-5 10 minute heat cycles. 2-3 10 minute slow riding sessions at no more than 1/2 throttle. Then let her rip.

You also can't go wrong with Duncan's break-in procedure. Although most will say it's a little much, better safe than sorry.

http://www.duncanracing.com/TechCenter/2stkenginebreakin.pdf

I use this same method, Tbone. Overkill or not, this procedure works. I little extra care paid up front beats frying a piston and a fresh bore again.

Pumashine · « **Reply #7 on:** August 14, 2014, 09:16:56 AM »

Quote from: PORTED R;40904

Honestly I really haven't done "proper" break ins
I got my motor back from nate ,started it up a few times ,checked for leaks ,went 300 foot racing next day
I recently pulled the head ,everything is super clean and lubed and great compression

Drag race builders put a .005 clearance on the piston too keep from seizing up at the track. When using the recommended .003 clearance you need a little time for the piston to wear in.

Rupp250 · « **Reply #8 on:** August 14, 2014, 09:30:37 AM »

No "proper" break in on anything I run. Put it together, couple heat cycles idling in the garage. Recheck nuts bolts, let it rip.

And Ported R's motor is not a drag motor either. It is a dune setup that he just used to go racing.

etccb · « **Reply #9 on:** August 14, 2014, 09:54:35 AM »

^^^^ I have always done the same myself. ^^^^
I am not saying it is right and you should do what you feel good about but I have always and will likely always do this.

udontknowme · « **Reply #10 on:** August 14, 2014, 08:33:14 PM »

i dont understand the .005" for drag racers. whats the theory behind it supposed to be ?

jfwyatt1 · « **Reply #11 on:** August 14, 2014, 09:12:47 PM »

thanks guys i just wanted to be sure. hopefully get around to putting everything together sat.