Prefference For Stroker Cranks 77.7 Or 73.7mm Stroke.

[STATUS]

I have got some Billet RB26 cranks coming in (and SR20) and i have to figure out a mix ratio of 77.7 and 73.7mm strokes.

which would you guys prefer to use yourselves?

No questions on pricing please, dont want to upset mods.

Edited November 26, 2009 by URAS

[_Ryan_]

can they be used for RB20 strokers? (Curiosity)

[N1GTR]

RB30 for being cost effective.

But there's probably people that can be lured with a similar price option.

I know you said don't ask price, but as a topic for discussion I feel it should be stated

[bigmikespec]

Full counterweighted 73.7mm RB26 crank. I would do bad things for one... whore myself out to 600 fat chicks for $10 each, that should get me a Tomei one!

[STATUS]

RB30 for being cost effective.

But there's probably people that can be lured with a similar price option.

I know you said don't ask price, but as a topic for discussion I feel it should be stated

The 73.7mm std stroke version will be comparable to a new nissan stock 26 item, and th 2.8l 77.7mm version will be a bit more.

I did not want to discuss it till we sort out an agreement with SAU, which i cant do for a few weeks as im in the process of changing our business model and name (no more mechanical) and we now only tune, build engines and develop product for a few local companies.

I should add that the 73.7mm is STOCK stroke but forged full-counter, the 77.7mm is also forged full-counter but is used as the base for 2.8 kits.

Edited November 26, 2009 by URAS

[STATUS]

can they be used for RB20 strokers? (Curiosity)

yeah depending on setup.

[noone]

cant we have both options

[W0rp3D]

(no more mechanical)

So that means i need to find a new mechanic.

Will these be any good for a 25, if i can find an easy way to re reg the fairlane then the 33 is coming off the road and im going all out.

[XRATED]

My vote is for the stroker crank...

1. the stock nissan crank is soo good that if you were going to get super serious with a 2.6 you've got enough cash to buy a brand name crank.

2. if you are going to go to the trouble of buying a crank... your probably going to look at a stroker anyway, especially if its simmilar money to a 2.6 counter crank.

3. if your replacing the crank, your most certainly going to buy rods and pistons. So you might as well get the similarly priced stroker crank, then buy the matching rods and overside pistons.

4. 2.8 is the best mix between a revvy 26 and a torqueeee 30... plus no new blocks, no cutting holes in bonnets and no fab/adapter plates.

5. who dosent love a stroker??? I bet most of the dirty thirty boys would have gone a stroker if the rotating assembley was cheaper!

hey, but that's just my opinion?

Cheers

J.

[MBS206]

My vote is for the stroker crank...

1. the stock nissan crank is soo good that if you were going to get super serious with a 2.6 you've got enough cash to buy a brand name crank.

2. if you are going to go to the trouble of buying a crank... your probably going to look at a stroker anyway, especially if its simmilar money to a 2.6 counter crank.

3. if your replacing the crank, your most certainly going to buy rods and pistons. So you might as well get the similarly priced stroker crank, then buy the matching rods and overside pistons.

4. 2.8 is the best mix between a revvy 26 and a torqueeee 30... plus no new blocks, no cutting holes in bonnets and no fab/adapter plates.

5. who dosent love a stroker??? I bet most of the dirty thirty boys would have gone a stroker if the rotating assembley was cheaper!

hey, but that's just my opinion?

Cheers

J.

If you can do me a rotating assembly for less then $2000 all built (head included) sure, I'd do it...

And who said they don't rev?

I'm about to have mine retuned for 7500RPM in the new year... Onlly reason I won't go higher is the cams that are in it aren't suited to hard revving.

[XRATED]

Dude... read the post.

As I said " 5. who dosent love a stroker??? I bet most of the dirty thirty boys would have gone a stroker if the rotating assembley was cheaper!"

If you could have a 2.8lt stroker set up for 2k would you consider it?

"And who said they don't rev?" some of Aussie's best GTR/Skyline tuners for the last 15 years!

7500rpm wooooo.... my stock 15yo 400rwkw 26 was raced to 8.6K for 2 years (thats not special either)... but it's not the overall rpm, it's the way/how quickly it revs.

I'm not going into the endless rb30 v's rb26 v's rb28 . FFS!

Edited November 28, 2009 by XRATED

[bigmikespec]

In all seriousness it would be very interesting to see the final pricing if it is indeed comparable to the standard crank price ($1200-$1500?), there would be no reason not to get one. When you think about it all the designs and R&D is done by companies such as HKS and Tomei. Get one of their cranks and copy it...

I voted 73.7mm, can't get passed the HiOctane R32 and its full counterweight Tomei crank nessled in a GT block!

[N1GTR]

When you think about it all the designs and R&D is done by companies such as HKS and Tomei. Get one of their cranks and copy it...

That really takes away from the "rareness" (sorry, lack of decent word) of those kits if everyone has one.

Also, there's something not right about just selling copies of other companies products that have spent all the money/effort etc on R&D to only be taken advantage of by people too lazy to make their own.

[bigmikespec]

That really takes away from the "rareness" (sorry, lack of decent word) of those kits if everyone has one.

Also, there's something not right about just selling copies of other companies products that have spent all the money/effort etc on R&D to only be taken advantage of by people too lazy to make their own.

I know what you mean and I agree 100%, unfortunately it is the way the world is going. There is a certain country that is doing pretty well by copying other companies products... not saying it is right!

[N1GTR]

I know what you mean and I agree 100%, unfortunately it is the way the world is going. There is a certain country that is doing pretty well by copying other companies products... not saying it is right!

Yep for sure, although on the flip side if people from other countries didnt send parts there to be copied it would be less of an issue. Both sides are to blame

And to stay on topic, ill never run a crank thats a copy of a big brand name. Design it from scratch or dont have anything to do with it IMO

[MBS206]

Dude... read the post.

As I said " 5. who dosent love a stroker??? I bet most of the dirty thirty boys would have gone a stroker if the rotating assembley was cheaper!"

If you could have a 2.8lt stroker set up for 2k would you consider it?

"And who said they don't rev?" some of Aussie's best GTR/Skyline tuners for the last 15 years!

7500rpm wooooo.... my stock 15yo 400rwkw 26 was raced to 8.6K for 2 years (thats not special either)... but it's not the overall rpm, it's the way/how quickly it revs.

I'm not going into the endless rb30 v's rb26 v's rb28 . FFS!

Oh, just to be fair... I'd think about a stroker when the right one comes out... The one for the RB30... 3.3L...

[N1GTR]

^^^^ Hahahahaha love it

[STATUS]

That really takes away from the "rareness" (sorry, lack of decent word) of those kits if everyone has one.

Also, there's something not right about just selling copies of other companies products that have spent all the money/effort etc on R&D to only be taken advantage of by people too lazy to make their own.

I should proabaly also add they are not copies, they are off the same line as the "brand " name gear.

I looked at bringing the stock stroke cranks in aswell as ive bought over 5 new GTR cranks from nissan in the past 12months for builds due to not being able to find suitable 2nd hand items (nearly all are bent or cracked) i figured i may aswell use a nice billet crank instead of the stocker if it cost the same.

[saliya]

That really takes away from the "rareness" (sorry, lack of decent word) of those kits if everyone has one.

Also, there's something not right about just selling copies of other companies products that have spent all the money/effort etc on R&D to only be taken advantage of by people too lazy to make their own.

Hang on, what we're talking about is a crankshaft for an inline 6, right?

By that logic, _those_ guys that have copied the relevant Nissan dimensions (e.g. rod-rod distance) should not be doing that; and Nissan should not be selling a 4-stroke motor with overhead cams, and ...

Far better to pool all that knowledge; get what works, and use that as a basis for future refinement. Kind of what we use the forums for. Stop people repeating the same mistakes.

R&D is about being first-to-market or improving on an existing design to make sales. I bet the very first <foo> crankshafts were simple copies of Nissan's cranks with some minor changes.

Then more technology from e.g. the racing world was imported. Did HKS invent the counter-balanced crank? No. How about knife-edging? Nup. Do some of their cranks have those features? You bet.

Have they got an advantage for being first- or best-to market? Yes. Should that advantage continue in perpetuity? Hell no.

If the design _can_ be patented (good luck doing that with a crankshaft unless it has some completely new feature) then the innovator gets some extra benefits other than actually being in the market.

Let's face it; there are only so many options for crank dimensions, design, and materials choice for the RB26. Most of those options would already have been explored.

A good crank will incorporate the good and leave out the bad. I say bring on more people making quality crankshafts.

Regards,

Saliya

[FineLine]

Another vote for the 2.8 stroker. As for copying. Hogwash! how the hell do you copy a crank. is a crank is a crank is a crank and so on ad infinitum.