M30B34 Rev2 Opinions

Discussion pertaining to positive pressure E28s.
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Digital
Posts: 31
Joined: Feb 14, 2015 6:00 PM
Location: Dearborn heights Mi

M30B34 Rev2 Opinions

Post by Digital »

This is a semi long story but I will try to make it short. Swapped a M30B34 with motronic 1.3 in my 89 E30. Life was good enjoyed the extra power, one day power shifting as normal my engine stalled. Got it towed to my house to realize that no kidding the crank balancer / trigger wheel fell off and took my cps with it. Bought a used balancer and cps and it fired right up. I purchased a e90 for my daily so the e30 can get some tlc.

Enough of the back story so here is where I am at, engine stripped down to bare block. I tore the head down and had it resurfaced. Just lapped the valves and installed new valve seals. Put in some bimmerheads hd rockers in. New rocker locks (two piece collar style) will be done this weekend. Just ordered new eccentrics and hardware. I will be putting in a Febi B35 cam as soon as they come back in stock.

This leaves me with the bottom end, checked the bore and as far as I can see everything checks out. So new main and rod bearings (king brand) and most likely new rod bushings. New piston rings (deeves) will be done as well. I am on the fence to get the bores deglazed or do it myself. Cross hatching is still present and the bores look good. Should I get the crank checked for balance? There is light scoring on the journals but not that you can feel.
Piston skirts have a wear marks but nothing that catches a finger nail.
Main goal is to do a dual tune on e85 and water meth 400hp daily with a option to go to around 600hp. Plans are oring the block arp studs and megasquirt and of course a decent size turbo. Any input would be great to hear.
Last edited by Digital on Jul 24, 2020 9:50 PM, edited 1 time in total.
marc79euro645
Posts: 444
Joined: Dec 09, 2008 12:33 AM

Re: M30B34 Rev2 Opinions

Post by marc79euro645 »

Sounds like a cool build. What turbo are you going to use?
Digital
Posts: 31
Joined: Feb 14, 2015 6:00 PM
Location: Dearborn heights Mi

Re: M30B34 Rev2 Opinions

Post by Digital »

I am still trying to decide on a clutch and a turbo. I know the hx40 should get me the numbers I am looking for but so will a more modern turbo. My build has a long way to go and I don’t plan on my E30 being 100% complete till April 2022. Goal from now to the end of the year is to have the engine put back together and sealed up.
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