Originally posted by e30sh
View Post
Announcement
Collapse
No announcement yet.
Delanoso's 2.9L Build
Collapse
X
-
Originally posted by Delanoso View Post...ForcedFirebird, what's the best way for me to get in contact with you? I'm willing to pay for the tune and time you can offer so that I'm certain I've got the right set up...
Missed this. Email is in signature: John@m20guru.com. Can call the office, but I am usually out in the shop hands-on (check voicemail daily): 954-786-3100
Comment
-
Originally posted by Delanoso View Post
I'd disagree though, that there's nothing to suggest I didn't get the parts I requested. 160whp is significantly below anyone's estimate based on the parts we used so I didn't get something I paid for, which means it was worth it to verify.
a true proper port job is worth a lot but the average head guy is mostly prettying things up and little else except in the case where the head is just garbage e.g. old pushrod cast iron job from 80's/90's which is not the case with the stock m20 885 head.89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
Comment
-
Originally posted by e30sh View PostHave we confirmed that it is an 84 mm crank? The balancing pads on those rods look huge compared to the M 42 world from which I come.89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
Comment
-
Originally posted by digger View Post
the balance pads having nothing to do with the crank or its balance. the rods are balanced against each other and nothing else so you can chuck a set of matched rods and not need to rebalance anything. its an inline 6 with balanced primary and secondary forces
I am aware of that. I'm referring to the physical size of the balancing pad. The 2.8 Tu rod has a much smaller balancing pad when you Google up a pic. That pad looks like your normal M20 or early M50 on the photos I've found. Just trying to confirm it has the correct parts.
Comment
-
Originally posted by e30sh View Post
I am aware of that. I'm referring to the physical size of the balancing pad. The 2.8 Tu rod has a much smaller balancing pad when you Google up a pic. That pad looks like your normal M20 or early M50 on the photos I've found. Just trying to confirm it has the correct parts.
while the pan is off he can measure the stroke fairly easily (or atleast the distance from the bottom of rod when at BDC to the oil pan flange or some other datum and i can measure the same on a known 84 mm crank here)
at BDC the very bottom of rod should be 22 mm below the block where oil pan gasket fits if it is a 84 mm stroke
i.e. crank throw + cap height - crank C/L to pan flange
= 42 + 40 - 60 = 22 mm for 84 mm stroke
or
= 37.5 + 40 - 60 = 17.5 mm for 75 mm strokeLast edited by digger; 08-04-2020, 02:50 AM.89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
Comment
-
Ah, after being here at work with rods all over the place, yes, those appear to be m20 rods, but have wide shoulder for the bolts, and rounded edges? I have some early m50tu rods here that have a small square pad, then some s50 rods that have almost no pad on them.
Now that is concerning if they told you they used m52 rods - the m52 rods are significantly lighter, not that there would be a power difference, just would help the rev up speed.
Comment
-
Originally posted by e30sh View PostHave we confirmed that it is an 84 mm crank? The balancing pads on those rods look huge compared to the M 42 world from which I come.
Originally posted by ForcedFirebird View PostNow that is concerning if they told you they used m52 rods - the m52 rods are significantly lighter, not that there would be a power difference, just would help the rev up speed.
Also, Just sent you an e-mail.
Comment
-
Originally posted by Delanoso View Post
Yes we have, 1432277 was on the crank and it's very definitely blue, which makes it forged as opposed to cast. My research shows that the the m50 cranks were cast so it would have to be the M52B28 or an M54 bizzarro. Correct me if I'm wrong - obviously, I seem to be wrong more often than not with this motor.
http://www.new-part.com/product/bmw-...kshaft-1432277
is the pan off?89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
Comment
-
Originally posted by digger View Post
Adam (skifree) has measured and cataloged a lot of crank casting numbers, I would trust him over "new-part.com"...
Also these list them as "x28i":
Get the best deals for Crankshaft / 1432277 at eBay.com. We have a great online selection at the lowest prices with Fast & Free shipping on many items!
EDIT: ...and just realized I have one sitting here at the shop with the same casting #:
Top row in the pic, the modified crank is definitely 84mm.
I also have a 1748751 and 2242898 sitting here.
Comment
-
I saw this post as well as a few others.
https://www.bimmerforums.com/forum/s...-Crank-casting
I feel pretty good about the number being correct.
Comment
-
I don’t doubt the 84mm are those forging numbers but it maybe the case that the smaller cranks use the same forging but get machined differently. I don’t know if that is possible or correct but raising as a possibility. I have seen pics that suggest the m52b25 crank is actually cast so idkLast edited by digger; 08-06-2020, 01:29 PM.89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
Comment
-
Originally posted by digger View PostI don’t doubt the 84mm are those forging numbers but it maybe the case that the smaller cranks use the same forging but get machined differently. I don’t know if that is possible or correct but raising as a possibility. I have seen pics that suggest the m52b25 crank is actually cast so idk
Comment
-
Originally posted by ForcedFirebird View Post
All the 75 and 81mm cranks I have come across have "H75" or "H81" cast into them. The only way I have been able to identify (without measuring) the longer throw cranks is by the casting/forging numbers. It might be different in other countries?89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
Comment
Comment