Stroker build

[jcolley]

Originally Posted by IMG

The car is still running the stock injectors. We will upgrade injectors and fuel delivery system down the road if they decide to switch to full e85.

I stand corrected, I thought this was the one that had the ID 1050x.

[Bemo]

Originally Posted by SYT_Shadow

it has crossed my mind... I have a problem

This would be beyond insane...so much so that it would make perfect sense. Do it!!!

[Montaver]

Man what a machine, this is going to embarrass some serious metal on the circuit. Sub 2:00 at WGI incoming

I have serious spec envy x1000

[8500RPM]

Originally Posted by SYT_Shadow

it has crossed my mind... I have a problem

This thing with the new stage 2 Harrop on E85 would decimate all!

[exVtekGuy]

I'm impressed with the top end torque and how it does not drop off as drastically as other stroker dyno like below.

https://www.m3post.com/forums/showthread.php?t=849797

i wonder how much of it is attributed to the cams?

[SYT_Shadow]

Originally Posted by exVtekGuy

I'm impressed with the top end torque and how it does not drop off as drastically as other stroker dyno like below.

https://www.m3post.com/forums/showthread.php?t=849797

i wonder how much of it is attributed to the cams?

it's hard to know as this build has several mods that improve breathing which are not typical at all

-It's the only build with Karbonius intake. The Karbonius is so much bigger than the stock one that if there was any restriction there it's gone now
-Bimmerworld headers. Headers have marginal gains on stock displacement engines that are NA, but on a stroker like this it's likely they are a bigger influence
-Headwork. The stock head is great but the exhaust ports are not fully CNC'd, so there has to be something to gain there
-Finally the cams. Earlier Alekshop got like 24whp just from changing cams to 284s, but their graph still doesn't look good and drops off a lot at high rpms. The 292s avoid that. If they made 304s that accept Vanos I'd consider them as I think there is more to be had, but I'm not willing to lose Vanos to gain hp.

[Helmsman]

Congratulations SYT!! Proper dream coming through.

[8500RPM]

Originally Posted by SYT_Shadow

it's hard to know as this build has several mods that improve breathing which are not typical at all

-It's the only build with Karbonius intake. The Karbonius is so much bigger than the stock one that if there was any restriction there it's gone now
-Bimmerworld headers. Headers have marginal gains on stock displacement engines that are NA, but on a stroker like this it's likely they are a bigger influence
-Finally the cams. Earlier Alekshop got like 24whp just from changing cams to 284s, but their graph still doesn't look good and drops off a lot at high rpms. The 292s avoid that. If they made 304s that accept Vanos I'd consider them as I think there is more to be had, but I'm not willing to lose Vanos to gain hp.

I'm sure Karbonius and Headers really shine on this build. I've always wondered my nobody does head work on these cars especially NA, at least I haven't read about it.

[SYT_Shadow]

Originally Posted by 8500RPM

I'm sure Karbonius and Headers really shine on this build. I've always wondered my nobody does head work on these cars especially NA, at least I haven't read about it.

Ah i forgot to list that, the headwork this one has.

It'll be a while until people do builds with just one of those mods to see where the most bang for the buck is

[8500RPM]

Originally Posted by SYT_Shadow

Ah i forgot to list that, the headwork this one has.

It'll be a while until people do builds with just one of those mods to see where the most bang for the buck is

I think people are scared to re-time their motors if they rip off the heads which I don't blame them. Sending S65 heads off to be ported/polished and cam install would be nice to see for stock bottom end guys looking for more NA power.

[SYT_Shadow]

Originally Posted by 8500RPM

I think people are scared to re-time their motors if they rip off the heads which I don't blame them. Sending S65 heads off to be ported/polished and cam install would be nice to see for stock bottom end guys looking for more NA power.

Timing as a DIY is probably not very simple but I'm sure it's doable. I'm also curious what 292 cams would do on a 4.0L engine

I look forward to getting a dynojet so I can compare in the same graph vs the Alekshop engine and I bet there is no loss of power at low rpms

[Bx Tpr]

Well done to everyone involved. Watching the engine come together at IMG was awesome and kudos for keeping it NA.

Now you can stop playing games and get a Pcar ..... you're welcome 😒

[IMG]

Originally Posted by Bx Tpr

Well done to everyone involved. Watching the engine come together at IMG was awesome and kudos for keeping it NA.

Now you can stop playing games and get a Pcar ..... you're welcome 😒

LMAO

[dfwashere]

Awesome build broski!

[SYDAUSM3E92ZCP]

Well done to all who contributed to this build...you guys really knocked it out of the park with this one!!
For all the N/A fanatics out there, I believe these are finally the numbers we've all been hoping (no praying!) are achievable from the S65. Let's hope it can withstand track abuse. I guess the stroke/bore/wrist pin size/rod type etc will all determine this. This has certainly aroused a 'stir' in me! Again, well done guys!! 👌

[SYT_Shadow]

Originally Posted by SYDAUSM3E92ZCP

Well done to all who contributed to this build...you guys really knocked it out of the park with this one!!
For all the N/A fanatics out there, I believe these are finally the numbers we've all been hoping (no praying!) are achievable from the S65. Let's hope it can withstand track abuse. I guess the stroke/bore/wrist pin size/rod type etc will all determine this. This has certainly aroused a 'stir' in me! Again, well done guys!! 👌

Thank you. Previous stroker results had frustrated me as there was no way those were achieving max potential.

500whp is a proper result!

It will be tracked heavily and if it blows it blows, but given the engine builders I find it very unlikely.

[Obioban]

500whp/.83 (17% drivtrain loss)= 602 crank hp

602/4.6= 131 hp/L

[Obioban]

What's your redline now?

[SYT_Shadow]

Originally Posted by Obioban

500whp/.83 (17% drivtrain loss)= 602 crank hp

602/4.6= 131 hp/L

finally an S65 build you can get behind! hehehe

[pbonsalb]

Revving to 8500 helps get more air in and out of 4.6L. Makes at least the top end power more like what a 6.2L can do at lower rpm. Obviously still can’t have the low end power of a 6.2L.

[SYT_Shadow]

Originally Posted by Obioban

What's your redline now?

It's still at 8600rpm, although it wasn't dyno'd further than ~8100 as you see from the charts. It was hot and humid in Long Island and the car spent half a day being dyno'd continually with a substandard fan

When it cools down we'll do some 8600 pulls to see if it can make any more power. Last night we had a engine build celebration and the builders still think there's more to be had, but we'll see. I'm happy as is, it feels infinitely more engaging than the F80 CS as you can imagine.

[Obioban]

Originally Posted by SYT_Shadow

finally an S65 build you can get behind! hehehe

It sounds 100% freaking amazing-- like everything I love in an engine.

Originally Posted by SYT_Shadow

It's still at 8600rpm, although it wasn't dyno'd further than ~8100 as you see from the charts. It was hot and humid in Long Island and the car spent half a day being dyno'd continually with a substandard fan

When it cools down we'll do some 8600 pulls to see if it can make any more power. Last night we had a engine build celebration and the builders still think there's more to be had, but we'll see. I'm happy as is, it feels infinitely more engaging than the F80 CS as you can imagine.

That's why I was asking about the redline-- it didn't look like your engine had leveled off yet necessarily, and it seemed like there should still be RPM on the table.

... Have you considered fooling with the intake trumpet length at all? If you're going to rev it another 8500rpm, and can't cam it further, you might be able to shift the curve up/right with some shorter runners. Almost certainly you're outside of the design spec of the stock runners at this point