Ray said the balance shaft delete was the worst thing he ever did......
Ray said the balance shaft delete was the worst thing he ever did......
Newbie FAQ My Build Thread
From stock, to GT3071, to substantially less modded, many lessons learned!
3" HTP | 100 Cel DP | Autotech HPFP | AP V3 - Self Tuned on E20 | JBR RSB | CPE S2 REM | JBR Shifter Bushings
No amount of engine balancing will eliminate second harmonics tho. 4 cylinder engines are inherently unbalanced regardless.
correct - the only truly balanced 4cyl is the boxer engine.
also - my engine did have individual rotational balancing and the balance shaft can't be attached when balancing the crank.
I have driven a fellow members car where he did the balance shaft delete and it did have a small increase in vibes which wasn't too bad, but no where near the amount mine had when on boost. The more power the engine is producing the more intense the second harmonics are due to larger amount of rotational momentum.
Well I figure it can't hurt to try. I can install it later if I'm not happy. Installing it wrong would cause more damage than not installing it all.
Yeah, I understand that an inline 4 cylinder is inherently unbalanced, even more so when going over 2L...
Was saying that a engine that has been balanced without a balance shaft should see less increase in NVH than an engine that was balanced with it, which then had it removed...
Or do I have that wrong?
Newbie FAQ My Build Thread
From stock, to GT3071, to substantially less modded, many lessons learned!
3" HTP | 100 Cel DP | Autotech HPFP | AP V3 - Self Tuned on E20 | JBR RSB | CPE S2 REM | JBR Shifter Bushings
Balance shaft is only for NVM like you said. Balancing is done without the BS.
I think every body will experience different levels of unbalance from minor machining differences, assembly etc. I've read of people feeling less vibes after a BSD.
Engine and new parts have gone to the machinist today. Full balance being done, block honed and cleaned, head just getting standard clean/rebuild with new seals. Hopefully go back together next week.
What exactly is involved in having an engine balanced? What do they physically do?
Last edited by Reedy; 29-09-2014 at 03:07 PM.
Firs they weigh the rods and pistons and ensure they are all the same weight and even weight distribution top - bottom - left - right.
then they spin each rotational part individually to make sure the centre of gravity lays on its axis of rotation. similar concept to when they balance a wheel+tyre when your tyres are changed.
Passing comments combined with personal research mostly
Just spoke to my machinist and he recommended a line bore be done. ARP mains made the tolerances really tight.
Last edited by ledfootrob; 09-10-2014 at 01:26 PM.
OK so I got all my parts back today and here are some progress shots
Gave the block a quick scrub
BSD & Oil squirters installed. Clearance from piston checked, no worries @Reedy
Crank Installed
I removed 2mm from 2 of the main bolts. They fouled on the balance shaft.
Should be able to finish off the rotating assembly tomorrow.
Pretty lucky on the main studs, mine needed about 3-4mm taken off and needed to use a thinner washer to clear the balance shaft - did you have to take anything from the nut for it to clear?
That issue with the studs is such crap. It's ridiculous that they can sell those as suitable for the MPS.
Definitely interested to see what you think of the BSD, would like to come from a drive sometime in it as well.
What Engine mounts are you using?