For anyone that has built a Stroker?

[e30Squid]

There are a lot of threads about building stroker motors....but not much about the finished product. I want to hear from anyone who has completed a stroker build, and your thoughts about whether or not it was worth it? How does the car feel?

If you could please briefly describe your build, and the corresponding results (Fun Factor)

1. What parts did you use?

2. How does it compare to a stock M20B25 ("i") motor?


***Yes I searched....there is a lot to read through, with few comments on the results. I have an "i" motor now, but have a lead on a budget stroker build with an SETA engine and I head***

[JasonC]

People, a stroker is when you change the stroke of the engine. Not when you do a head swap.

Here is a good thread with numbers, http://www.r3vlimited.com/board/showthread.php?t=97872

[RickSloan]

i tore down a 3.1l m20 stroker today...

bad gas = melty pistons

but man was that thing bad ass for the last 4 years. and now it will move out to make room for the shops 3.2l version ;)

[e30Squid]

People, a stroker is when you change the stroke of the engine. Not when you do a head swap.

Here is a good thread with numbers, http://www.r3vlimited.com/board/showthread.php?t=97872

Thanks for the link, I had looked through that thread earlier and just read through it again. There is definatley some good info.....If I have a 88' Seta block with an "i" head would't that be a different stroke than the origonal M20B25?

I am just looking for some feedback on the finished product. I used to have an "eta" and enjoyed the torque. If I could end up with an engine that has the same hp as an "i" with a broader torque curve it may be worth it.

Thanks again....all feedback is appreciated.

[Cyrix2k]

People, a stroker is when you change the stroke of the engine. Not when you do a head swap.

Here is a good thread with numbers, http://www.r3vlimited.com/board/showthread.php?t=97872

http://www.fordmuscle.com/archives/2003/09/stroker/

You're correct, but it's really a matter of perspective. Starting with an eta and doing a headswap is not a true stroker, but starting with a 325i and swapping in a different crank for an increased stroke is a true stroker. The people with eta who call this a stroker see the motor as having more in common with the b25 than the b27 and the end result is the same regardless of if a b25 or b27 was used as a starting point.

[lennon]

if you already have a good super-eta bottom end, and a good 325i head, then it's not a waste of time. or if you're gonna do it right with custom pistons, more than 2.7L, etc, etc, then its not a waste either.

[e30Squid]

if you already have a good super-eta bottom end, and a good 325i head, then it's not a waste of time. or if you're gonna do it right with custom pistons, more than 2.7L, etc, etc, then its not a waste either.

Thanks for the reply. That is what I need to hear. I have a line on a super-eta bottom end that has already been mated to a good 325i head and has all new bearings and seals (and I can get is for next to nothing). I have a MM lightened flywheel that I am installing in the next couple weeks and I'm trying to decide if I want to install it on the "i" motor or go with the hybrid engine.

I would love to do custom pistons, but that is not going happen at the moment.

[lennon]

the super-eta bottom mated to a 325i m20b25 head is essentially a 2.7 "i" motor. definitely go for the extra stroke. there isn't much of a downside.

[JasonC]

http://www.fordmuscle.com/archives/2003/09/stroker/

You're correct, but it's really a matter of perspective. Starting with an eta and doing a headswap is not a true stroker, but starting with a 325i and swapping in a different crank for an increased stroke is a true stroker. The people with eta who call this a stroker see the motor as having more in common with the b25 than the b27 and the end result is the same regardless of if a b25 or b27 was used as a starting point.

Thanks for the Ford link. But i'm well aware of what a stroker is. I got two 383 strokers. Well, more like one now. Down to one now since the one broke the crank. It's just been a pet peeve of mine about people calling these head swaps "strokers". So i like to bitch about it once and awhile :p

[SmokeE30]

basically yea its a head swap if you star with an eta bottom end but either way it has its advantages. i've helped put together a few 2.7i's now and i'd say they are deffinetly worth it, i think the biggest advantage of it over a stock b25 is the increased torque you get much more low end grunt so you can cruise around real low in the rpm and short shif it like your driving an eta but you still have 2k more usable rpm then an eta abd better flow.

also droppping compression is nice for boost but even na these do alrighty, mu buddies seta motor with a ported i head and cam and few other bolt ons runs with e36 m3's

[maddydaddy]

if you already have a good super-eta bottom end, and a good 325i head, then it's not a waste of time. or if you're gonna do it right with custom pistons, more than 2.7L, etc, etc, then its not a waste either.

So, if you are not going bigger than 2.7 it's a waste? I have aM20B25 and want to put a eta crank with custom pistons of about 9.75 to 1. Is it worth it?

[digger]

the cost to go from a 2.7L to a 3.1L is not huge if you are already getting custom pistons with the 2.7L. Its pretty much just finding a crank, and the spacer for oil seal.

[MeinBMW]

the cost to go from a 2.7L to a 3.1L is not huge if you are already getting custom pistons with the 2.7L. Its pretty much just finding a crank, and the spacer for oil seal.

To get to that 3.1L what crank is it? One from a SETA? Sorry but I'm still trying to learn this stuff :)

Thanks!

[digger]

To get to that 3.1L what crank is it? One from a SETA? Sorry but I'm still trying to learn this stuff :)

Thanks!

M54B30 or S52B32 crank (89.6mm stroke)

[briansjacobs]

I think the cheapest thing to do if you have a SETA with the I head is to just boost it. It will cost about $3500 installed and looking at over 300RWHP with 12-13 psi. or keep the boost at a very low and reliable 10 psi and look at 275 RWHP. the SETA NA will be about 160 RWHP.

I have a fully built 2.8 race motor and im 180RWHP on 110 octane. I have about $3000 into it in parts to build it. (custom pistons,cam,Ltweight flywheel, billet rockers and so on)