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Kyle B
01-27-2000, 10:51 PM
anyone out there ever built or know anyone who has built a stroker M20 using the 2.5l block/pistons and the crank out of a 323i????

Lee
01-28-2000, 06:56 PM
Hartge did it. They had the H2.3, H2.6 and H2.7<p>If you build such an engine, do not use the head from your 2.3, instead get one from a 325i. The valves are bigger than the 323 head.

Kyle B
01-28-2000, 09:00 PM
already have a 325i, im planning on building a 2.6 with the 323 crank. what cam did Hartge use in the H26? was it a 272? im thinking of a 288, but im worried about valve to piston clearance if i go with the 323 crank.

Lee
01-28-2000, 09:18 PM
When people want a big baby six, they usualy opt for a 2.7 at least, up to a 2.9.<br>They use either the Eta or the Diesel crank, the later being forged.<br>Metric Mechanis even adds bigger forged pistons to reach the 2.9 barrier.<br>NOBLE used to sell modified pistons for such a conversion. Pete McHenry, Eric Kerman do these engines. I believe that an Eta block and pistons will work if the pistons are modified to avoid interference.

Kyle B.
01-29-2000, 10:31 AM
i have no plans for using the ETA crank. no way. not gonna happen.<p>secondly, how is it that people get 2.9 liters with the TD crank? when i was reading specs on it, i thought the stroke was shorter than 2.5 crank (i could be wrong, i read these a while ago). displacement is a few cc's smaller than the 2.5, so without boring out the cylinders i dont see how you can reach that figure of 2.9l.<br>the 323 crank is the way to go.

Lee
01-29-2000, 02:42 PM
The Diesel crank is forged, it is supposedly stronger than an Eta crank. The Diesel engine may have a smaller capacity, but as we all know, engine capacity is the resultant of bore and stroke. Maybe the bore is very small and the stroke is the same as the Eta, all that in order to get more torque. As for the 2.9, Metric Mechanics uses bigger forged pistons.

wes
01-29-2000, 03:00 PM
THE TD CRANK IS SAME STROKE AS 2.7e IT USED SMALL PISTONS AS IN 323. IT IS BASICALLY A STROKED 323i WITH A DEISEL HEAD MAKING IT LARGER THAN THE 323i<p><p><p><p><i>: The Diesel crank is forged, it is supposedly stronger than an Eta crank. The Diesel engine may have a smaller capacity, but as we all know, engine capacity is the resultant of bore and stroke. Maybe the bore is very small and the stroke is the same as the Eta, all that in order to get more torque. As for the 2.9, Metric Mechanics uses bigger forged pistons.<p></i>

Kyle B.
01-29-2000, 10:50 PM
ok, that makes sense. where in the world can i find tech data on the TD motor??? ive looked everywhere but i cant find any...so, if the stroke is the same at the ETA, and the bores are small like the 323i, then how do you arrive at the 2.9l figure without boring out the cylinders????

wes
01-30-2000, 12:59 AM
you need to use the td crank, 325 block, 325i connecting rods, and custom oversise 325i pistons. also use the 325i head more power less work. it is actually a 2.8 (2.7 with standard 325i pistons)http://www.nw.net/bmw-td/ try this site i haven't been there yet but i found it on the 5er board<br><i>: ok, that makes sense. where in the world can i find tech data on the TD motor??? ive looked everywhere but i cant find any...so, if the stroke is the same at the ETA, and the bores are small like the 323i, then how do you arrive at the 2.9l figure without boring out the cylinders????<p></i>

Lee
01-30-2000, 01:32 AM
Bore x stroke<p>323i: 80mm x 76,8mm=2316cc, compression ratio is 9,8 to 1<br>325i: 84mm x 75mm=2494cc, compression ratio is 8,8 to 1<br>325e: 84mm x 81mm=2693cc, compression ratio is 9,1 to 1<br>324td: 80mm x 81mm=2443cc, compression ratio is 22 to 1<p>Metric Mechanic uses 85mm pistons to reach 2756cc with the Eta crank and connecting rods. I know of other companies that produce a 2,9 litre engine.

Kyle B.
01-30-2000, 10:37 AM
awesome. where did you get these specs? i looked all over the internet and i couldnt find any tech data whatsoever on the 324td or 524td?

Lee
01-30-2000, 04:00 PM
These specs come from BMW 3-SERIES by Jeremy Walton. Edited by Osprey Automotive. The best book ever on 3-series.

Frank
02-01-2000, 05:38 AM
<i>: anyone out there ever built or know anyone who has built a stroker M20 using the 2.5l block/pistons and the crank out of a 323i???? <p></i><p>Hi I am ready. The original was 320i. I changed the crank to 81mm (324d) The rods are shorted, and the piston is left the original 320i. 16.2Bar/cyl. I changed the "butterfly from 320i to 325i. The car is stronger than how it was. Only a little faster than stock 325i. top=220Km/h, 0-100Km/h ~8 sec (somteimes 7.2 sometimes 8.9sec) depend on the wheel spinning on start and switching from 1 to 2. The differential is now 3.91 and the gearbox is Getrag 240( original 320i)<br>I know it is not a "big shut" anyhow it is not bad in the city on the green lamp. <p>I planning to shave a little from the headbolt and overbore a little the incam side of the headbolt.<p>I wellcome every suggestion and idea and anything.<p>Bye Frank from Hungary. ;-)

///ARINUTS...
02-01-2000, 10:02 PM
Unless you are revving well over 7K Rpm you really don't need the TD crank. And have you ever seen or herd of a broken eta crank. Not me only herd of a thrown #5 Rod under extreme use above 7k RPM. i Use an eta crank and rods with 88 super eta pistons and the rest is all 325i with cam and head work. over 220 HP. No Problems here!


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