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Engine mods for reliability?
https://www.ausmini.com/forums/viewtopic.php?f=5&t=71825		 Page 1 of 1
Author:  Harley [ Wed Jul 13, 2011 10:42 am ]
Post subject:  Engine mods for reliability?
My engine has been taken out of the car because a gearbox bearing has died, so whilst it's apart I'm going to look at anything I can do that may be suggested as a reliability mod.

Thinking new oil pump, double row timing chain, and even crack testing / balancing the crank.

Are there any other things that should be considered whilst I have the chance to do it and do it right?

Thanks.
:D
Author:  drmini in aust [ Wed Jul 13, 2011 7:34 pm ]
Post subject: 
Lighten the flywheel and backplate, and then have it all dynamically balanced when you do the crank.
1275 cranks have peak vibration points in the 3000-4500 range. Lightening the rotating mass moves these torsional vibration points in the crank assembly further up the rpm scale. Hopefully out of your normal cruising rpm, so improving crank life.

Wedging the crank helps this too, not only does it lighten the crank but it changes the balance factor (similar to increasing the counterweighting)- this helps stop the main bearings wearing oval (a common 1275 problem).
Here's one I prepared earlier (shown after milling, but before linishing).
Image
Image
Author:  gafmo [ Wed Jul 13, 2011 8:26 pm ]
Post subject: 
Ill ad on to Kevs Post. What connects on to the Crank can throw the crank balance out also. Get the Rods Balanced and Straightened.
Match the ports on the Inlet and outlet Manifolds
Choice of Cam
Author:  mattsmadmini [ Wed Jul 13, 2011 8:35 pm ]
Post subject: 
electronic ignition,
not over the top cam,
regular oil changes,
keep the engine/carb in tune
Author:  Harley [ Wed Jul 13, 2011 8:51 pm ]
Post subject: 
The engine is a coil pack SPI unit.
External the the engine itself, everything else has been refurbished / rebuilt / renewed.
I'll be leaving the stock cam in there, but may consider 1.5 rockers.
At least if they have negative or no effects they're more easily removed.
Author:  NG [ Thu Jul 14, 2011 10:44 am ]
Post subject: 
get a good spi cam from uk.

you can get that support pinion that Kad sell for the gearbox. helps with longer final drives. you have a 2.9?

you could cryo parts to last longer like cranks etc.

cryo treatment works, all sc components engines are cryo treated when made/sold.

bigger bearings maybe? roller bearings? oil feed tapping on thrust washers is a good mod as well.
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