S65 with flat plane crank

[Checkcaptain]

Originally Posted by kiln

specs of the stroke, piston size, and brand/type of rod would be nice. Were you building a 4.4L or 4.6L? Don't you already have a Dinan 4.6L?

OEM Dinan Mahle pistons 94mm, custom rods and 82mm crank.
4550ccm.

[redux]

Originally Posted by Longwong

I don't know. An S65 already sounds pretty amazing and will never sound Ferrari V8 largely because of firing order and somewhat the flatplane. But certainly would not go through this trouble on this engine. I actually don't understand why the race car does do (or did do) a flat crank S65 and then they use restrictor plates on the intake??? So the little weight you shave off is it really worth that in a race applications? I guess so but to a road car I don't even think you would be limited by the cross plane crank in terms of making NA hp if you were to build the motor and cams and run it to 9k. I think with built parts naturally aspirated you can gain a ton of power with the cross plane how it is and not much more with a flat plane

The weight savings depends on how extreme you are willing to go with the crankshaft design. I'm guessing a flat plane crank would be offer somewhere in the area of 20% to 30% weight saving over a cross plane due to the reduction of size in the counterweight and few other design considerations. That's a sizable chunk inertia your rotating assembly won't have to deal with.

Please follow these instructions before you attempt to derail this thread with more bad/false information:


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7. Find the reference material the author used to write articles
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Originally Posted by Checkcaptain

I have no PM rights on this board.
I sell crank, rods complete pistons and Head gascets for 9500EUR.

Unfortunately, my willingness to be a guinea pig when it comes to large scale engine modifications has faded with with age. However, if you are able to run this kit for around 20,000km without the engine shaking itself to pieces, I'll be more open to purchase the crank (with some cams).

[Checkcaptain]

Originally Posted by redux

The weight savings depends on how extreme you are willing to go with the crankshaft design. I'm guessing a flat plane crank would be offer somewhere in the area of 20% to 30% weight saving over a cross plane due to the reduction of size in the counterweight and few other design considerations. That's a sizable chunk inertia your rotating assembly won't have to deal with.

Please follow these instructions before you attempt to derail this thread with more bad/false information:


for iTunes -
1. Search for "Race Engine Technology" app
2. Download app
3. Don't be put off the $17 magazine prices, the first one is free
4. Pick your issue
5. Read said issue
6. Understand what was written in issue
7. Find the reference material the author used to write articles
8. Read reference material
9. Understand reference material
10. See step 4


for Windows -
1. Download iTunes
2. See step 1 of iTunes instructions

for a hard copy -
1. go to www.highpowermedia.com
2. see step 4 of the iTunes instructions








Unfortunately, my willingness to be a guinea pig when it comes to large scale engine modifications has faded with with age. However, if you are able to run this kit for around 20,000km without the engine shaking itself to pieces, I'll be more open to purchase the crank (with some cams).

I am only selling my regular stroker Kit.
I will be the guinea pig testing the flat plane

[redux]

Oh, I thought you were going to sell the flat planes cranks. My bad for posting while drunk.



If your flat plane project is a success, I'd love to pick up a crank up from your engine builder.

[Checkcaptain]

Originally Posted by redux

Oh, I thought you were going to sell the flat planes cranks. My bad for posting while drunk.



If your flat plane project is a success, I'd love to pick up a crank up from your engine builder.

What would it help without cams ???

[Checkcaptain]

Anyway - ordered it now

[esquire]

Originally Posted by Checkcaptain

Anyway - ordered it now

What's the ETA for arrival and then installation. I'm curious to get your review and see the results. Thanks for guineau pigging this.

[RingMeister01]

Epic

[dex37]

Originally Posted by Checkcaptain

Anyway - ordered it now

That guy is sick. Somebody, please, call emergency to pick him up.

[RingMeister01]

Originally Posted by dex37

That guy is sick. Somebody, please, call emergency to pick him up.

[DOUT]

Boss

[redux]

Originally Posted by Checkcaptain

What would it help without cams ???

I said that I'd also pick up some cams in an earlier post, I was just too lazy to type it again. Then again, it may be better to get a set made to my specifications due to the head work and larger bore in the works for my s65.

[redux]

Checkcaptain,

What is your plan to deal with the ramifications of the 2nd/4th order vibrations cause by going to a flat plane crank? The added stress on the main bearings can be somewhat negated by balancing your rotating assembly to a desired rpm, but what about isolating those harmonics and such from the valve-train? (sorry for asking so many questions, this kind stuff is sort of my thing)

[Soorena]

Originally Posted by Checkcaptain

Anyway - ordered it now

[Checkcaptain]

Originally Posted by redux

Checkcaptain,

What is your plan to deal with the ramifications of the 2nd order vibrations cause by going to a flat plane crank? The added stress on the main bearings can be somewhat negated by balancing your rotating assembly to a desired rpm, but what isolating those harmonics and such from the valve-train? (sorry for asking so many questions, this kind stuff is sort of my thing)

I will talk to one of the factory drivers of the GT2 and GTE soon.
Let´s see what he says in direct comparison.
Thereafter I will decide what exactly I am going to do.

[s65e90]

Originally Posted by Checkcaptain

I will talk to one of the factory drivers of the GT2 and GTE soon.
Let´s see what he says in direct comparison.
Thereafter I will decide what exactly I am going to do.

Vibrations won't be took bad. Motors that have flat plane cranks would benefit from balance shafts but maybe not 100% necessary

[Checkcaptain]

Already excited about the 1-8-2-7-4-5-3-6 firing order:-))

[VCMpower]

Originally Posted by Checkcaptain

Already excited about the 1-8-2-7-4-5-3-6 firing order:-))

Can't wait for video!

[1MOREMOD]

Originally Posted by dex37

That guy is sick. Somebody, please, call emergency to pick him up.

Crazy man!

[Rapture]

[aus]

What exhaust are you going to run with it? Akra still?

.

[Longwong]

Originally Posted by s65e90

Vibrations won't be took bad. Motors that have flat plane cranks would benefit from balance shafts but maybe not 100% necessary

As stated above the z4 gte has a cross plane crankshaft and they purposely chose the cross-plane because it lessened the vibration problem and decreased longevity of the m3 gt2. So if the gte race car went cross plane for longevity than it says something to me. Especially since they are making as much power with the cross plane as they are with the flat plane in the m3 gt2. Tells me there is no benefit in power with the assembly and I gues its down to saving a bit of weight in the crank which if you also read, just like a driveshaft or flywheel, heavier is not always worse, especially in a large rotating piece that is actually storing and releasing energy constantly and weight savings in pieces like that make for negligible power gains.