Stroke motor bottom end clearance

[USMC_Turbo6]

Is this the proper clearance for a stroker motor with a crank 3.625 and a rod of 5.970? If not I would appreciate it if someone would give me the proper bottom end clearance. Thank you

Bottom end clearances
----------------------
Main bearing........................ 0025 in
Con rod bearing.................... 0025 in
Con rod side to side.............. 018 in
Piston to wall....................... 004 in
Piston ring eng gap: top ring... 016 in
second ring........................... 014 in
Crankshaft end play.............. 004 in

 

[Nick Micale]

Is this the proper clearance for a stroker motor with a crank 3.625 and a rod of 5.970? If not I would appreciate it if someone would give me the proper bottom end clearance. Thank you

Bottom end clearances
----------------------
Main bearing........................ 0025 in
Con rod bearing.................... 0025 in
Con rod side to side.............. 018 in
Piston to wall....................... 004 in
Piston ring eng gap: top ring... 016 in
second ring........................... 014 in
Crankshaft end play.............. 004 in

Here are my thoughts:

Rods/mains......0.0020" - 0.0022"

Rods side..........0.006"

Top ring gap....0.020" depends on ring type?

Piston..........manuf spec, usually 0.005"

 

[USMC_Turbo6]

Thanks Nick for you help

 

[turbofabricator]

I agree with Nick and will add that the second ring gap should be .024" Opening up the second ring gap helps stabalize the ring pack under boost.

 

[USMC_Turbo6]

Here is what I have for the bottom. Do what I have look right? Thanks for all of your help guys.

Main bearing........................ .0020-.0023 in
Con rod bearing.................... .0020-.0023 in
Con rod side to side.............. .006-.018 in
Piston to wall....................... .045-006 in
Piston ring eng gap: top ring... .018 -.020 in
second ring........................... .024 in
Crankshaft end play.............. .005-.0010

 

[750H.P.V6]

With .006" piston to wall you'll get psiton noise on start up .005" works better. I'd run a bit more ring end gap on the top ring myself. Rod side clearance will sort be what it is but .010" works well I wouldn't want much less. Stock rods usually have quite a bit more closer to the .018 you stated which works fine too.

Neal