Author Topic: High compression 1.9 project thread (Read 12266 times)

2002maniac · « **Reply #15 on:** March 28, 2006, 10:56:04 AM »

I'll be using a M44 headgasket which has an 86mm bore.

The reason I didnt go with a M44 to start with is that the M44 has a cast crank that is not even fully counter-weighted.

I think the added compression ratio will also give much better response and power.

I am still waiting for my core to be pulled from the car

tim_s · « **Reply #16 on:** March 28, 2006, 12:00:43 PM »

Quote from: 2002maniac

I'll be using a M44 headgasket which has an 86mm bore.

The reason I didnt go with a M44 to start with is that the M44 has a cast crank that is not even fully counter-weighted.

I think the added compression ratio will also give much better response and power.

I am still waiting for my core to be pulled from the car

sure, but in practice it makes very little difference imo (that's from experience, i've been in an m44 engined e30, and my brother owns an m44 e36). the m44 crank has been proven to be able to cope with high rpm and high bhp etc, it is also pretty light so you get nice low rotating mass. when you say not fully counterweighted, it IS counterweighted, it just uses half the number of counterweights of the e30 crank! you could always lightly skim the head to bring up the CR a little, even go with oversize pistons etc.
you'd get a much newer block which wouldn't have 15+ year old water channels etc. and it would probably cost less. you'd also get the revised oil squirters, newer front timing gear, pulleys etc.

my 2.1 is running 11:1 CR, was intrigued to see whether you were going to run the m44 gasket, i've been considering it, but think i may go custom to get the correct bore, i have no idea whether the m44 one will work well being a smaller dia.

2002maniac · « **Reply #17 on:** October 29, 2006, 10:06:20 PM »

Update + slight change of plans.

I had the block bored for the S52 pistons $200

The guy I bought the pistons from had planned on using them in a turbo motor and had had the oil ring groove modified for Total seal rings so I called up total seal and got a set of rings

I FINALLY found time to finish the pistons. I ended up milling 2mm off the deck and then I had to redo the valve pockets. This turned out to be a huge PITA due to the funky setup I had to do. I am happy with the outcome though and I dont think there is any way that the integrity of the pistons was compromised.

I also have decided to use an M44 crank even though it is cast and not fully counterweighted. I have seen M44 make plenty of power with superchargers or turbos and they seem to hold up just fine.

This isnt a race motor by any means and I'll be keeping the RPMs to 7200max so i'm not really worried about the crank.

I am still going to double and triple check all my measurements but heres what I have:

Combustion chamber volume 34CC
Piston dish 10cc
deck height .5mm
Displacement will be just short of 2 liters.

According to a few internet calculators, I should have ~9.5:1 CR. A little lower than I hoped, but that makes my decision to boost it much easier

here's the money I've spent on parts so far:

pistons-100
Bore block, hot tank, and gap rings-200
rings-120
Crank-175

Pics!

Valve pocket detail.

asubimmer · « **Reply #18 on:** October 29, 2006, 10:20:40 PM »

lookin good!! I can't wait to see how it turns out. We are basically doing the same thing but backwards. I plan on doing s52 pistons when my engine gives.

e9nine · « **Reply #19 on:** October 30, 2006, 06:00:18 AM »

Hot stuff. Keep us updated

dino245 · « **Reply #20 on:** October 30, 2006, 09:55:46 AM »

2002maniac has done my pistons and I too am using the M44 crank. After much debate about the quality of the semi-counterweighted crank I will be suing it since I have the stuff and money is tight. I have a set of used M44 rods coming and M44 valves, as well as some lighter piston pins that weigh 85 grams and not 108 grams like the stock pins. I will be using a 1.5mm head gasket so the CR will be around 10.5:1. We shall see how this works out.

Alpine003 · « **Reply #21 on:** October 30, 2006, 10:29:31 AM »

Sounds like a good budget build. Nice work.

With no knock sensor, you sure you don't want to up it to 11:1?:p

2002maniac · « **Reply #22 on:** October 30, 2006, 11:39:53 AM »

Dino, What's your source for the lighter pins? Aftermarket or OE from some other car? I also need the link to the company that has the AEG lifters for $130. The best price I can find so far is like $10 each.

Thanks.

I also ordered some Grade 12.1 head bolts from Boltdepot.com

They are only 90mm rather than the stock 95mm but we'll see what happens.

When I was measuring the thread pitch on the old stretch bolts I was shocked by how much they had stretched.

2002maniac · « **Reply #23 on:** October 30, 2006, 11:42:12 AM »

Quote from: Alpine003;12902

Sounds like a good budget build. Nice work.

With no knock sensor, you sure you don't want to up it to 11:1?:p

It really wouldnt worry me a bit with good tuning. I've been looking into megasquirt and it's capabilities of running COP's

Megasquirt is VERY impressive as far as features go, and online support is almost endless.

dino245 · « **Reply #24 on:** October 30, 2006, 11:46:37 AM »

The lifters are here fourseasontuning.com
And the wrist pins are from top end performance they have a few different options but the ones I will be opting for are cheap and lighter than stock. Oh by the way I will be using the M44 crank, 2002maniac. I dont have money for what I would realy like to build, so the M44 will have to do until I get a bunch of money. I am hoping for 175hp crank

nickmpower · « **Reply #25 on:** October 30, 2006, 02:24:49 PM »

whats the story on the lifters???

dino245 · « **Reply #26 on:** October 30, 2006, 04:34:52 PM »

The stock BMW M42 lifters weigh 74grams each and the VW lifters from the AEG engine weigh 48 grams each go to fourseasonstuning.com and look at there oem engine parts.

2002maniac · « **Reply #27 on:** October 30, 2006, 04:59:41 PM »

Quote from: nickmpower;12921

whats the story on the lifters???

it also looks like the AEG lifters hold less oil so they will be even lighter when you compare the weights of each lifter pumped up with oil.

nickmpower · « **Reply #28 on:** October 30, 2006, 08:54:14 PM »

i thouht holding more oil was better for high rpm? has anyone actually used or test fit them? whats the redline of the engine they come from? they are much cheaper then bmw lifters but that could be a bad thing

2002maniac · « **Reply #29 on:** October 30, 2006, 09:56:29 PM »

16v volkswagen guys use them over 8krpm