Good idea to Stroke?

[Shavenyak]

x2 on shooting for a zero deck on the stroker (<.010"). Anyhow after the stroker project, I will be saving up to buy a 95-98 m3(I've wanted one for 13 years now). You can bet that the newest m3 is still the real deal. If you want to get the I-6, get the twin-turbo 335 and you'll be able to boost that to 400hp&ft/lbs with a few grand in mods.

Don't feel bad, I still lust for an E30 M3

 

[BBeach]

I haven't heard much about the new BMW V8. Care to enlighten us?
The problem with the BMW I6 is that they crack, and when they do, nobody makes a new cylinder head for them. I have seen quite a few with severe cracks so I had to tell the customer we could not help him. luckly he was able to find another used one that did pressure test good.

~Alex

I think its a great design, but of course the twin turbo inline 6 with a chip almost makes it not worth it to spend the extra dough on the V8.
http://www.roadfly.com/bmws-new-m3-v8-engine-official-m-v8-engine-specs.html

 

[gradon]

It definitely is lust.

 

[seanyb505]

The new 135 comes with the turbo I6 i believe, chip that and make 400 hp.

 

[purplexj]

Besides that your motor should have alot more life left. Mine was'nt well taken care of before I got it, and with over 200k is still running well. But I want a stroker too. Just don't want high compress or to run hi test. Hopefully it will get better mpg's too. Even better would be going diesel.

 

[wolfpackjeeper]

I am gonna be honest and say i didnt measure a damn thing or use the compression calculator at all. I had my block decked .01 and bored .06 over. threw it together and got a good valve and head job. It will run mid grade unless it is increadibly hot, then it will ping occasionally. Runs like a champ on 93.

Lets be honest, why the big deal about running 93, it is generally cleaner, and cost me what $3-4 dollars more a tank, usually less.

 

[gradon]

I am purposefully trying to make mine high compression so it'll have to use 93. It was a totally fine 122K 94 block and I have a totally fine 74K 96 engine. I am rebuilding for performance/fun and find it pointless to buy all these nice parts and not be willing to spend $5 more per fillup. Now maybe others are rebuilding out of necessity and figure why not stroke it in the process, but still want to use 87--who knows. I do know that up til a year or so ago the price difference b/t 87 and 93 was $.20 a gallon. Now it is $.30+(like other states), so you know our refineries are pocketing that difference.

 

[alex22]

The problem with higher compression engines is that the octane levle at the pump is very rarley checked, which puts your engine at the mercy of the station owner/ truck driver/ gasoline depo.

~Alex

 

[Shavenyak]

93 doesn't necessarily run cleaner. It combusts slower (the higher the octane rating, the slower combustion). If it doesn't combust completely during the power stroke, it can leave MORE deposits than a lower octane fuel.

 

[wolfpackjeeper]

which would be why you dont run 93 in a low compression motor

 

[BBeach]

which would be why you dont run 93 in a low compression motor

And the fact that 87 has more energy per mass than 93.

 

[wolfpackjeeper]

easily more. But it is easier to make good power with a better compression ratio, which does not run as well on 87...

I do pretty good on 89, if i get a good quality fresh 87 in there it will run ok in the winter, but as the temps increase I have to bump to 89. 93 is not necessarily cleaner, but it tends to run better in all of my cars so it is what I run.

 

[BBeach]

easily more. But it is easier to make good power with a better compression ratio, which does not run as well on 87...

I do pretty good on 89, if i get a good quality fresh 87 in there it will run ok in the winter, but as the temps increase I have to bump to 89. 93 is not necessarily cleaner, but it tends to run better in all of my cars so it is what I run.

Of course, and also advance timing. My scangauge gives me the same timing numbers for 87 as it does 93 as without a knock sensor, the computer doesnt know what octane we're using. I dont think the same would go for a renix though because i believe they have em.

 

[wolfpackjeeper]

the odd thing is I have had a lot of people come into the store lately and want to replace the knock sensor on their 97+. We even have a picture of it in the computer even though I know that there is not one