Originally Posted by Stealth97
(Post 561359)
Just get the cast SOHC protege crank, its like 10 or 11lbs lighter
sohc 1.8, 91.5-94 (don't want a small nose...) |
I just don't see it doing much. Enough to notice anyway. I'm with Jason on the flywheel comment.
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Originally Posted by therieldeal
(Post 561432)
beat me to it... they work fine for n/a applications and low boost. plenty strong enough.
sohc 1.8, 91.5-94 (don't want a small nose...) |
I've been running the SOHC crank for three years now, had it balanced along with the rods, sees 8k RPM's on occasion, its super smooth. Half the counterweights make for less windage loss as well.
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Like other state, the more you leave the stock engine the better which they got their own magic.
Although many of you do not listen to this... It is the same blcok of a competition Mazda 323 GTR pushing more than 300 HP, backj in PR who have done 10s the crank is stock...\\\\ IMO, leave it alone, the crank in stock trim is bullet proof. |
Im next inline at Cardelli's for my 1.6 crank.
Are you doing this also Nick? |
The loss in spool is due to some type of inertia situation I am not bright enough to explain. Mine had a shit ton taken off of it. 7 or lbs.
I saw no gains at all. It just looked cool and sounded smart. if budget is a worry, I would pass.. |
Loss in spool is kind of a myth.
The car may show less boost at a given RPM in logs in say 1st, but car accelerates faster. |
Originally Posted by railz
(Post 561729)
Im next inline at Cardelli's for my 1.6 crank.
Are you doing this also Nick? |
Originally Posted by JasonC SBB
(Post 561209)
Rebello in Northern CA?
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Originally Posted by JasonC SBB
(Post 561839)
Loss in spool is kind of a myth.
The car may show less boost at a given RPM in logs in say 1st, but car accelerates faster. |
Bingo. Load a dyno as if a Miata weighs 3500LBs and a 35R will spool like 2860 in terms of RPM.
The lighter crank means you are probbably spending less time in 1st, 2nd , etc gear, which will slow your spool a bit. Basically you have less time at a decent load state to spool the turbo. So chances are the perceived boost threshold will be higher, despite the car accelerating better. From what I can see the weights are for driveability and NVH reduction more than for the engine itself, like the balance shafts you see in a lot of I-4s. |
Rebello has been doing Datsun work for many many years and is one of the Bay Area's and maybe one of the nation's best 4/6 cyl machinists/engine builders.
They built a wicked n/a 2.4i setup for my friends 510 datsun that screamed. |
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