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Old 03-23-2021, 02:31 PM   #1
YEG850i
1st Gear Newbie
 
Join Date: Mar 2021
Location: Edmonton
Posts: 2
1991 BMW 850i m70 project



Hello everyone,

Im a long time lurker, first time poster. I've always been a fan of German vehicles, mostly owned Volkswagens or Porsche and recently (within the past 5 years) bought my first BMW. Last year I came across a beat up, almost dead 850i. This car was my dream car when I was 15 so when i saw this list for a few grand I jumped at it.....but it needs a TON of work. I possibly may have bit off more than I can chew, especially since I've never worked on an engine or restoration before.

The plan is to replace the stock 75mm crankshaft with a performance 86mm and increase the bore from 84mm to 85mm or 85.5mm with forged pistons and rods. I'm thinking about keeping the original 8.8:1 compression ratio but may drop it to 8.6:1 because I also want to boost it later. Looking at going with Schrick 264 camshafts. I dont know if I need to upgrade my lifters, springs or valves to accommodate the added horsepower.

I have started the process to find where I can buy these parts but almost all of them lead overseas or from the US......I wish we had Canadian companies that custom made forged pistons and crankshafts. There is a company out of Australia (www.pureperformancemotorsport.com) where I could buy all of those things, but i'd likely be paying way more and then pay customs on top of that. I'd really prefer to keep the money going to a Canadian company as opposed to going overseas.
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Old 03-25-2021, 07:56 PM   #2
M4Mason
1st Gear Newbie
 
Join Date: Mar 2021
Posts: 15
That sounds like an awesome build. You got any pics??
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Old 04-16-2021, 05:05 PM   #3
MANDD
Autobahn East
 
Join Date: Jul 2005
Location: Ajax
Posts: 306
Great stuff.

Find an M73 motor (5.4), use your M70 cylinder heads with schrick cams and get a wokke chip. With this combo you will be just a hair under the CSI power figure.

Also check out racing power plant dot com.

Mark.

Quote:
Originally Posted by YEG850i View Post
Hello everyone,

Im a long time lurker, first time poster. I've always been a fan of German vehicles, mostly owned Volkswagens or Porsche and recently (within the past 5 years) bought my first BMW. Last year I came across a beat up, almost dead 850i. This car was my dream car when I was 15 so when i saw this list for a few grand I jumped at it.....but it needs a TON of work. I possibly may have bit off more than I can chew, especially since I've never worked on an engine or restoration before.

The plan is to replace the stock 75mm crankshaft with a performance 86mm and increase the bore from 84mm to 85mm or 85.5mm with forged pistons and rods. I'm thinking about keeping the original 8.8:1 compression ratio but may drop it to 8.6:1 because I also want to boost it later. Looking at going with Schrick 264 camshafts. I dont know if I need to upgrade my lifters, springs or valves to accommodate the added horsepower.

I have started the process to find where I can buy these parts but almost all of them lead overseas or from the US......I wish we had Canadian companies that custom made forged pistons and crankshafts. There is a company out of Australia (www.pureperformancemotorsport.com) where I could buy all of those things, but i'd likely be paying way more and then pay customs on top of that. I'd really prefer to keep the money going to a Canadian company as opposed to going overseas.
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