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02-24-2015, 12:40 PM | #67 | ||
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02-24-2015, 12:42 PM | #68 | |
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I would only do valve springs/ retainers and have no cocerns spinning the motor to 9k. |
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02-24-2015, 09:18 PM | #69 | |
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The stock bore and stroke is 92 mm and 75.2 mm, for a 1.22 bore:stroke ratio. If I bore it to 94 mm and stroke it to 79.2 mm, the displacement would be 4.4L, but the bore:stroke ratio drops to 1.18, so it's less over-square than a stock S65. This would seem to beget a lower redline. Thus, the question then is whether using lighter weight parts (e.g., lightweight rods and titanium valve springs and retainers) would help me maintain my at least my current 8.6k redline if not boost it to 9k despite the less over-square bore:stroke ratio. The dream would be to have a higher displacement motor that spins higher than the stock motor and yet is actually more robust and durable than the stock motor (both due to proper bearing clearances and less kinetic stress at high RPM). It will be tough, but fun. |
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02-24-2015, 09:34 PM | #70 | |
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02-24-2015, 09:37 PM | #71 |
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This isn't recommended or feasible. The weight is too high (pistons, rods, wrist pins). It might work out fine a few stints to 9000, but nothing reliably. Not to mention the cams don't make power past stock redline, and the 284's don't much either.
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02-24-2015, 10:06 PM | #72 |
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People spin the s65 to 8600 RPM already, I'm surprised to hear you say that pistons (OEM) are not adequate. I figure if no one is tuning the vanos profiles then cams are a given for a big HP all NA motor, but for the casual stint to 9k I don't see much more than valvetrain work.
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02-24-2015, 10:08 PM | #73 | |
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w/out a doubt, go all out. I was simply stating what I felt was the limited means to go safely to 9k. If you're building a piece, then def yes, pistons, rods, etc. I would love to see a 4.6 with ITB, dinan TB and cams with a built bottom end and a nice rear gear setup. Would be the perfect street car. |
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02-25-2015, 12:42 AM | #74 | |
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05-29-2015, 12:21 AM | #75 |
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Does anyone even make a CF driveshaft for the E9x M3? I think that would make a significant difference in the way it drives which is already awesome.
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05-29-2015, 12:46 AM | #76 |
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Very nice numbers! Good seeing you at bimmerfest. I'm sure there's some more ponies on the table
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05-29-2015, 12:58 AM | #77 | |
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Drives: S65 1M Clone & E92 M3 4.6L
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Im going to do as you suggested and see how the car does with 93octane. |
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05-29-2015, 01:06 AM | #78 | ||
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Sounds good, I think it will help as you had -5 deg global retard on all cylinders. Not sure if targeted timing is stock though. Dante, Teddy, and DJ should get together for a pow wow soon!
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05-29-2015, 01:16 AM | #79 |
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Ill let you know when I bring them down next. Would be cool to get the dogs on your side of town.
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05-29-2015, 10:41 AM | #80 |
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Always loved the Dinan stoker motors, If it wouldn't financially ass rape me I would so go that route haha.
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05-29-2015, 11:21 AM | #81 | |
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I originally purchased the car with the intention to remove the stroker and swap it with the 4.0L in my 1M clone but after driving the dinan m3 around, I really fell in love with it. Turner recently posted a interlagos m3 and now I am a bit inspired to do seats, coilovers and roll bar in this car too. |
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05-29-2015, 03:37 PM | #82 |
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Malek: have you heard of any s65 owners knife-edging the crank in conjunction with lighter pistons/rods? I feel like that would give this motor a FPC-like revvability.
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05-29-2015, 03:49 PM | #83 | |
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Only a few pounds of weight reduction due to the massive alum adapter plate, it did take out most of the drive train lashing you get when letting off gas at low speeds and alot of the clunk etc when easing out of 1st gear. You can twist the OEM drive shaft on car with your hand and it will move half an inch back and forth due to the two piece design. Also seems to launch a little better, more like a rubber band so does not break loose quite as quick. That being said it took almost a month to get the right parts in with my car on jackstands, sent wrong adapter plate first then sent wrong bolts for the new adapter plate.
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05-29-2015, 11:34 PM | #85 | |
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I can't speak for him, but I believe Malek has looked into this exact issue and may have something in the works. I'd imagine you'll see him post more about this soon. |
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05-30-2015, 12:54 AM | #86 |
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You make me want to cry thinking back. I could have bought a serious P car with all the mods I've done. I started with a lowly Ford Taurus (I had nicer cars previous to that, it was always my beater, ended up driving it as a daily though for a year). i love the M but I kind of regret dumping that kind of cash into such a badly depreciating asset (Porsches hold better, need less modding). Funny thing, once you reach the point of no return, you sake F it and go balls to the walls. So I too might at some point consider a built motor such as RDport's config (I'm not enamored with Dinan's, as you can't bore their 4.6 again)
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