number9va
Novice Class
Posts: 40
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posted January 29, 2004 07:19 PM
Stroker ?
If I have a 1290 and I add a 5mm stroker crank what size engine will I have and is it streetable.
  
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Horsepower
Parking Attendant
Posts: 22
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posted January 30, 2004 06:51 AM
Hello; Mike here from HPU. You would have a 1406cc motor. It would be streetable, but you would have to calculate your compression accurately. You would probably need to cut down the domes on the pistons to get the compression at an exceptable level so that the engine would start when hot. I did 1 of those combinations last year, and I believe that I set the compression at 12.8 - 13.0, and it ran good, and was ok with starting. Mike.
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ninja12
Needs a job
Posts: 3310
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posted January 30, 2004 01:18 PM
Mike,
What was the hp on that combination?
Did it live long?
Sounds like a monster if it stays together.
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MadMike
Moderator
FEAR THE BLACK FLAG!!!!!!!!
Posts: 6579
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posted January 30, 2004 03:18 PM
Hey Mike, I put the bug in Jims ear! and I have my stocker, over there and he has been looking at it. I am getting closer to convincing him! I will keep working on him and let you know as soon as I have a Yes out of him!
Mad Mike
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200-MPH CLUB MEMBER!
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Horsepower
Parking Attendant
Posts: 22
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posted January 31, 2004 06:34 AM
Ninja; Mike here. I cannot remember exactly what it made for HP.I know it was over 200, and the guy never got it tuned properly as far as I know. I have done a bunch of strokers, and they are all still together. I just finished 1 yesterday, and have another to do next week. The biggest problem is keeping the stroker cranks in stock. There is a local guy here with a 1436cc stroker that I did that made 230 HP on the dyno with just crude tuning, no sniffer. He is supposed to take it to be fully tuned which should add more hp. Mad Mike; That is good news. Please keep me updated. You can e-mail me at hpu@comcast.net Mike.
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number9va
Novice Class
Posts: 40
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posted January 31, 2004 05:40 PM
I am worried if it would run hot on the street and in traffic. May a 4mm or 4.6mm stroke would be better.
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Rac4IT
Needs a job
Bergie
Posts: 3009
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posted January 31, 2004 07:30 PM
manual fan switch, done.
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entropy
Moderator
Posts: 8671
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posted January 31, 2004 07:53 PM
 Edited By: entropy on 31 Jan 2004 19:55
strokers are GREAT for the street and will last forever if you are careful to keep the CR reasonable. EXACTLY what Horsepower is telling you above; listen to that man!
The folks getting 230hp are NOT doing it with setups that last (IMHO). I had my 1427 up to 229hp (260psi cold cranking) on a "not happy" dyno, but hot starting was a bitch, the bearings take a pounding, and you really have to put speciality fuel in it.
Keep yr stroker 13:1 or a bit less and you'll be a happy boy! Unless of course you drag it, then go for the gusto, but be prepared pistons are about $900 a set... All motor hp contests are not for those reluctant to spend 3-4 grand OFTEN.
hot running is a function of CR, keep it reasonable and you shouldn't have problems.
BTW: I am NOT using water wetter any more, even tho it really does seem to keep the engine from getting too hot. I suspect it had something to do with my last headgasket failure at the Texas Mile. Maybe not, but i'm thru with it, going w/Prestone & water.
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number9va
Novice Class
Posts: 40
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posted February 01, 2004 04:39 AM
Think I'll just go with the 1290 and balance & lighten the crankshaft.
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entropy
Moderator
Posts: 8671
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posted February 01, 2004 04:59 AM
number9va,
go to the trouble if you are gonna pull the crank & certainly change out bearings, why not stroke it??????? The difference in "torque" (lo-med rpm hp) is nothing short of amazing.
It's what the Busa boyz have been crowing about for 4 years. The stock Busa is more of a "stroker" than the 12 is after a 4.6mm. Its the reason why a Busa will ALWAYS pull a 12 in roll ons for even close to equal weight riders. Sorry guyz, but its true. Me a 12 owner...
On the street you will feel the effect of the added stroke MUCH more than you will the extra bore.
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This moderator uses moderation in moderation
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number9va
Novice Class
Posts: 40
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posted February 03, 2004 07:14 PM
Heard alot about the stroker but the start up problems and trying to get the compression right is to much for me.
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bossman12r
Zone Head
Posts: 513
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posted February 04, 2004 08:42 AM
Just get the 1375 stroker kit from Muzzy? You just have to install it and you are done.
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gen 4 zx10 is fast
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Johnnycheese
Pro
Posts: 1008
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posted February 04, 2004 08:48 AM
quote:
Heard alot about the stroker but the start up problems and trying to get the compression right is to much for me.
That is what an engine builder does for you it is worth the $$$$
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ZXLNT
Needs a job
Kawpuke Extraordinare
Posts: 2853
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posted February 04, 2004 09:29 AM
quote:
Just get the 1375 stroker kit from Muzzy? You just have to install it and you are done.
Not quite, an engine assembler would just put it together and call it good.
An engine builder like JohnnyCheese would put it together then tweak and tune until everything is right......
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ra12r
Zone Head
Posts: 919
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posted February 04, 2004 12:36 PM
A busa comes stroked 5mm compared to the zx12 from the factory. A zx12 is stroked compared to a zx9. The zx9 was a stroked zx7. I really miss the point. The crank shaft dimension are not the problem with durability. The problem is the individual builders that are not particular to the assembly process. I mean look at the zrx12 vs the zx11. Same motor different crank basically a stroker motor.......
The population of opinion here is also skewed. Most of the guys that post on this page are riders that push the motor to the upper 1/3 of extremes OFTEN!!! This "aggressive" style of riding will produce the same symptoms whether the engine is factory brand new or builder brand new. This applies to any engine. Use the motor really hard and it WONT last as long. Baby the motor and it will last forever. Dragracing expecially is one of the hardest applications to hardware!!!
Stroke your motor and cruise around and it will last as long as a OEM motor. Heat as posted above is not about the crankshaft. My stock zx12 ran hot in traffic as OEM........the radiator needs to be larger and it is next to the header. Which cars do you see designed like that??
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All must bow to the "Ra Supremecy"...
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number9va
Novice Class
Posts: 40
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posted February 04, 2004 04:54 PM
I have decided to go with the 1270 kit and a 10 inch arm.
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BA
Pro
Posts: 1592
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posted February 04, 2004 07:04 PM
10 inch arm? dude, you're gonna need a special shock with that if you want to launch hard AT ALL. Use a stock shock and you'll spin off the line, I practically guarantee it.
If you're just posin' then it's no big deal. You're good to go.
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number9va
Novice Class
Posts: 40
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posted February 04, 2004 07:16 PM
BA what type of shock.
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