S65 with flat plane crank

redux · 07-08-2013, 12:56 AM

BMW went back to the cross plane set-up in GTE because they were able to get a waiver that allowed them to use the current GT3 engine. The P65B40 used in the M3 GT2 is pretty much tapped after 4 years of development and moving to the P65B44 (with it's extra 400cc of displacement) gives them little bit of wiggle room. They're both also bespoke (ie almost nothing in common with the s65; hell, it's even cast from a different alloy) endurance racing engines, so BMW would have taken care any vibration/durability issues associated with use of a flat or cross plane crank long before the it engine leaves the dyno phase of testing.

Also, what BMW does in GT racing (besides GT4) has little relevance to what is done in our own street vehicles. Their habit of starting with the wrong vehicle and going crazy with waivers to make it competitive makes their GT class cars more like prototypes.

Longwong · 07-08-2013, 12:00 PM

I am just saying given he is also stroking the engine, if the gte can use 4.4 litres and the cross-plane to get almost 500 hp WITH an air restricter restricting it than someone is likely going to be fine with a stroker and cross crank for a street engine and make plenty of power and do it more safely without vibration so it lasts

M3Captain · 07-08-2013, 03:12 PM

Quote:

Originally Posted by Checkcaptain

Just thinking of rebuilding an S65 with a flat plane crank.
Posting here since I like to know if someone has done it already or knows about it, except the P65 engine of the GT2 car.

Lufthansa is paying you too much..... LOL

Good luck with the build. Hopefully there is some HP to be made beyond 8000RPM.

Checkcaptain · 07-08-2013, 03:34 PM

Quote:

Originally Posted by M3Captain

Lufthansa is paying you too much..... LOL

Good luck with the build. Hopefully there is some HP to be made beyond 8000RPM.

Lufthansa is paying me for safe landings in Frisco...

VCMpower · 07-09-2013, 03:03 AM

Quote:

Originally Posted by Checkcaptain

Quote:

Originally Posted by M3Captain

Lufthansa is paying you too much..... LOL

Good luck with the build. Hopefully there is some HP to be made beyond 8000RPM.

Lufthansa is paying me for safe landings in Frisco...

No doubt

M3Captain · 07-09-2013, 09:04 AM

Quote:

Originally Posted by Checkcaptain

Lufthansa is paying me for safe landings in Frisco...

Lufthansa pays you to leave the A/T on....

Checkcaptain · 07-09-2013, 11:19 AM

Quote:

Originally Posted by M3Captain

Lufthansa pays you to leave the A/T on....

Negative - Manual flight / Manual thrust

CeeBoogie · 07-10-2013, 06:54 PM

I wanna hear what this thing sounds like!!!

aus · 07-10-2013, 07:25 PM

Quote:

Originally Posted by Checkcaptain

Negative - Manual flight / Manual thrust

Is there a big difference in landing different planes?
They're making a big deal that it was his first landing of the 777.

.

Checkcaptain · 07-22-2013, 04:57 PM

Changed my mind and bought a complete GT2 Engine now.

1MOREMOD · 07-22-2013, 05:15 PM

Quote:

Originally Posted by Checkcaptain

Changed my mind and bought a complete GT2 Engine now.

Dude!

Longboarder · 07-22-2013, 07:07 PM

Quote:

Originally Posted by Checkcaptain

Changed my mind and bought a complete GT2 Engine now.

Serious?

How much?

Soorena · 07-22-2013, 10:15 PM

This guy is very mad.

OC ///M · 07-23-2013, 10:59 PM

Quote:

Originally Posted by Checkcaptain

Changed my mind and bought a complete GT2 Engine now.

Stop the madness!!!

1MOREMOD · 07-23-2013, 11:38 PM

good clip, signs!

MilehighM3 · 07-24-2013, 02:31 PM

[QUOTE=1MOREMOD]

Quote:

Originally Posted by Checkcaptain

Changed my mind and bought a complete GT2 Engine now.

Quote:

Originally Posted by 1MOREMOD

Dude!

No amount of poutine will help this man

1MOREMOD · 07-24-2013, 02:45 PM

[QUOTE=Bmw135er;14379981]

Quote:

Originally Posted by 1MOREMOD

No amount of poutine will help this man

I know! Must be nice if serious.

Longwong · 07-24-2013, 08:56 PM

Quote:

Originally Posted by Checkcaptain

Changed my mind and bought a complete GT2 Engine now.

Where and how much do these run?

IMG · 07-24-2013, 09:34 PM

Baller

M3Captain · 07-24-2013, 11:43 PM

Quote:

Originally Posted by Checkcaptain

Changed my mind and bought a complete GT2 Engine now.

Are you guys hiring? LOL.

Dope!

vm · 07-28-2013, 06:39 PM

Although flat plane cranks do save rotating mass, the main reason they are used in higher performance applications is not due to that but it is for exhaust optimization. In a flat plane application the exhaust pulses per bank are evenly spaced (every 180 degrees, just like in a 4 cylinder) instead of having two pulses separated by 90 degrees and two by 270. This unevenness makes for a less efficient exhaust.

Checkcaptain · 08-06-2013, 09:35 PM

Quote:

Originally Posted by Longwong

Where and how much do these run?

No Price tag on them

07-08-2013, 12:56 AM	#45
redux WTF does Stage 1 mean? 273 Rep 311 Posts Drives: Bwm and such Join Date: Jul 2011 Location: Singapore, Los Angeles, and such iTrader: (0) Garage List 2011 1M [9.35]	BMW went back to the cross plane set-up in GTE because they were able to get a waiver that allowed them to use the current GT3 engine. The P65B40 used in the M3 GT2 is pretty much tapped after 4 years of development and moving to the P65B44 (with it's extra 400cc of displacement) gives them little bit of wiggle room. They're both also bespoke (ie almost nothing in common with the s65; hell, it's even cast from a different alloy) endurance racing engines, so BMW would have taken care any vibration/durability issues associated with use of a flat or cross plane crank long before the it engine leaves the dyno phase of testing. Also, what BMW does in GT racing (besides GT4) has little relevance to what is done in our own street vehicles. Their habit of starting with the wrong vehicle and going crazy with waivers to make it competitive makes their GT class cars more like prototypes.
	Appreciate 0 Quote

07-08-2013, 12:00 PM	#46
Longwong Banned 38 Rep 370 Posts Drives: e92 m3 catless Join Date: Jun 2013 Location: USA iTrader: (0)	I am just saying given he is also stroking the engine, if the gte can use 4.4 litres and the cross-plane to get almost 500 hp WITH an air restricter restricting it than someone is likely going to be fine with a stroker and cross crank for a street engine and make plenty of power and do it more safely without vibration so it lasts
	Appreciate 0 Quote

07-10-2013, 06:54 PM	#52
CeeBoogie Private First Class 16 Rep 109 Posts Drives: E46 M3 Join Date: May 2008 Location: Long Island NY iTrader: (0)	I wanna hear what this thing sounds like!!!
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07-22-2013, 04:57 PM	#54
Checkcaptain Major 549 Rep 1,179 Posts Drives: BMW M4 GTS Join Date: Jan 2009 Location: Germany iTrader: (0)	Changed my mind and bought a complete GT2 Engine now.
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07-22-2013, 10:15 PM	#57
Soorena Captain 80 Rep 850 Posts Drives: M3 6MT Join Date: Dec 2011 Location: Paris iTrader: (0) Garage List 2013 BMW S1000RR [0.00] 2013 Ferrari 458 [9.66] 2012 Jaguar XJ SWB ... [10.00] 2011 E92 M3 [10.00]	This guy is very mad.
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07-23-2013, 11:38 PM	#59
1MOREMOD - 11817 Rep 23,187 Posts Drives: Race car-> Join Date: Mar 2009 Location: check your mirrors iTrader: (5)	good clip, signs! __________________ 02 Tiag e46 M3\|6MT\|GC plates\|MCS c.o.\|GC bars\|GC race control arms\|GC bushings\|BW eng. & tran. mounts\|subframe kit\|BW race shifter\|BW Jaffster\|Euro header\|BW exhaust\|K&N c.a.i.\|Epic race tune\|Rouge pulleys\|Seibon CF hood\|CSL bumper\|apr gt 250 & splitter\|ST-40\|XR-2\|SS lines\|half cage\|Recaro profi\|Profi 2 harness\|BMWpedals\|BW studs\|
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07-24-2013, 09:34 PM	#63
IMG 1122 Rep 7,690 Posts Drives: E36 M3 Track car,Ess E90 M3 DD Join Date: Feb 2008 Location: Location iTrader: (6)	Baller
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07-28-2013, 06:39 PM	#65
vm Second Lieutenant 11 Rep 239 Posts Drives: 2018 Alfa Romeo Giulia Join Date: Dec 2005 Location: Pittsburgh, PA iTrader: (5)	Although flat plane cranks do save rotating mass, the main reason they are used in higher performance applications is not due to that but it is for exhaust optimization. In a flat plane application the exhaust pulses per bank are evenly spaced (every 180 degrees, just like in a 4 cylinder) instead of having two pulses separated by 90 degrees and two by 270. This unevenness makes for a less efficient exhaust.
	Appreciate 0 Quote