Some M42 FI Affection

[Tor Arne Kaasen]

Hi Rob e30. do you use GT2871R to get that kinde of power? ore some other type. is the car 1,8 liter 109 cdi?

[BrandC]

VIDEOS, more of them and faster.

[dude8383]

VIDEOS, more of them and faster.

Haha

Where have you mounted the intercooler?

[rob_e30]

Hi Rob e30. do you use GT2871R to get that kinde of power? ore some other type. is the car 1,8 liter 109 cdi?

The turbo is bigger than the 2871 and the displacement is more than the stock 1.8L.  It's under 2.0L with a GT3071.

I'm kicking myself for not taking a video while it was running last night.

Here is a pic of the new front end...

[bmwman91]

Sheepdog, we really need a big, slobbering drool smiley.

Rob, how does the powerband come out?  Within the bounds of the secret-sauce confidentiality, what can you tell me about boost lag and peakiness of the power.

[dude8383]

Sheepdog, we really need a big, slobbering drool smiley.

Rob, how does the powerband come out?  Within the bounds of the secret-sauce confidentiality, what can you tell me about boost lag and peakiness of the power.

yes i'm quite interested to hear about this as well.

i see it is a front mount intercooler...did you have to cut out the bumper support or did you manage to fit in there?

[rob_e30]

I did cut out sone of the bumper support and trimmed the mouth of the new bumper cover.

Here are some more pics

[nickmpower]

hey rob, how many miles on the engine? have you done a leak down or compression test? Im having troubles with my rebuilt engine and another new engines compression or leakdown results would really help out

[rob_e30]

Zero miles since a complete rebuild.  Replaced the crank and using custom pistons.  CR is 8.5:1 so I'm not sure what my numbers would do for you by comparison.  I also have not done either test.

The leakdown is pretty straight forward...  What is the % leaking?
On the compression test, as long as you get a close reading on the same number of cranks with all of the plugs removed you should be in good shape.

[nickmpower]

I have about 20-30% leakdown. along with about 130-140 compression. And TONS of blowby. so much that the engine leaks from all the crankcase pressure. About 10 miles on the car

[rob_e30]

30% is starting to get to the high side.  Is the leak down the same on all cylinders?  Are you careful to make sure you're at TDC?  If you are at TDC if you rotate the crank a little back and forth slowly does it change the reading?  Rotating the crank will start to open the intake or exhaust valve and hear the air coming from the intake or exhaust manifold.

But, given that it's pressurizing the crank case I would suspect rings.  If it's the same for every cylinder then either the rings or pistons are not the correct size.

[nickmpower]

i think the machinist just didnt install them properly, but it could still be that they need to be broken in which is why i was wondering if you had tested it. What pistons do you have? ive got JE. if theres anyway you could do a leakdown that would help me a lot

Its hard to rotate the crank around TDC because it just turns over. all the air is going past the rings.

[rob_e30]

I won't get a chance before we head to the track this weekend, but I've not heard of rings needing to be broken in to solve your problem.  Have you talked to your machine shop?

I'll try and get one done for you early next week.

[nickmpower]

The machinist said it probably needs to be broken in more but im thinking hes just praying it some how fixes itself. Ive had so many problems with this engine before and now after the rebuild it makes me sick

if theres any way you can test just one cylinder before you head out to the track that would be great. It seems like after the mileage differences may be too great to make any sort of comparison

[Bunta]

I love this picture


Get them started early.  How many of us wish our dads were like this?

Cool project.  No love for the looks of the car but its really about what works.



Hunter