Building a 2.9l M50 stroker, HP, torque, cost, SMOG

[SpecM]

hell yea we do

^ true words

NC = win

[Smatt90IS]

Yep, we bang ours out with broom sticks haha.

hell yea we do

[MIKe30]

IF the engine was 95+ then it must have OBD2 cat... unless you are going to make the engine go as pre 95 and obd1. Magnaflow sells CA legal cats, even pre OBD2.

unlss the cats differed from the motors, think you mean 96 since 95 m3's were still obd1. 96 they became obd2.

[Jean]

IF the engine was 95+ then it must have OBD2 cat... unless you are going to make the engine go as pre 95 and obd1. Magnaflow sells CA legal cats, even pre OBD2.

[lifeiskaos]

Why would you need an OBD2 cat for an M50? Obviously the motor can't tell the difference between OBDI and OBD2 cats (except OBD2 may have a downstream O2 sensor, but 1) that's not part of the cat IIRC and 2) obviously the M50 isn't OBD2), are OBD2 cats more emissions-friendly than the OBD1 cats?

apparently all aftermarket cats have to be obd2 compliant now to be legal in california, so obd2 cat is needed for visual, unless you use the stock cat from the m50.

you're logic is wrong about the reliability question. OP is asking if the rebuilt m50 stroker would be more reliable than a used s50 motor. If everything is done properly it's probably the case, but who knows..

oh. then yeah, i agree with you. i must have misread his question

[iX-treame]

+1 for Massatwoshits. We rip cats out and sell them to the Brazilians!

Yep, we bang ours out with broom sticks haha.

[MIKe30]

answers in bold.

you're logic is wrong about the reliability question. OP is asking if the rebuilt m50 stroker would be more reliable than a used s50 motor. If everything is done properly it's probably the case, but who knows..

[Wh33lhop]

Why would you need an OBD2 cat for an M50? Obviously the motor can't tell the difference between OBDI and OBD2 cats (except OBD2 may have a downstream O2 sensor, but 1) that's not part of the cat IIRC and 2) obviously the M50 isn't OBD2), are OBD2 cats more emissions-friendly than the OBD1 cats?

[lifeiskaos]

1. 2.9l strokers semi built can get the s50 power for less money. less money? no way.

2. Well built m50 strokers can easily achieve more. more power? than what?

3. Cost would be lower than an s engine. again, no way. even a stock rebuild will cost more than a relatively low mile s50.


Now my questions

1. Reliability, less than the s50? this would be practically a new motor. I can get an m50 w. vanos at the local yard for $150 out the door, with a refundable 50 dollar core. Doest matter if it runs im rebuilding it anyways. s50 is just as reliable as an m50

2. Difficulty. obviously there are a lot of tools required to do the built im sure...I think most can be bought from harbor frieght or rented...am I right with this? yes

3. Smog....Will i be able to pass the sniff test here in cali with a stroker? or will the increased displacement fail me with flying colors. visual is not too much of a concern..most guys smogging will pass it for visual without much hassle from what i hear. but the emissions is the big problem. you need a bitchin custom chip tune, and a GOOD obd2 (legal) cat to pass the sniffer

answers in bold.

[Adrian_Visser]

What makes you so sure that you can get more power from a stroked m50 for less money than an s50/2?

[jeff_b]

Move to NC I dont even have to pass SMOG test haha

+1 for Massatwoshits. We rip cats out and sell them to the Brazilians!

[DynoTechMotorsports]

a good tune and a proper cat there should be no problem passing. as long as everythings there of course

[iX-treame]

Move to NC I dont even have to pass SMOG test haha

[MIKe30]

throw 8 cats on it and then remove 7 after sniff?

[e30s52]

You may pass visual but you wont pass the sniffer test.