Jnimbostratus Street Fighter Project

[giantkiller]

Want to sell one of them big blocks?

I think I'll hang onto them. I'm going to start with the stock 87 motor with the turbo. Till It doesn't get exciting. Anymore. Then put the 1450 on the turbo motor. Thought I'd use the Wisco block For a street fighter eventually. Just have everything on hold until I get my shop house built.

[jnimbostratus]

Out of curiosity and the nature of how my mind works. Are their any pistons interchangable with these fj series of motor and any other engines?

[fj1289]

Out of curiosity and the nature of how my mind works. Are their any pistons interchangable with these fj series of motor and any other engines?

I've done a little research on this - mostly found info about using busa pistons in GS engines.  It is easy enough to find piston pin diameters to see may be possible.  But finding the pin height to determine what may fit the cylinder height is problematic.  I'd say research as much as you can, find a couple that are worth trying, and try to eBay some and see how it goes.  I'm about 50% with these types of "science experiments" for my FJ.  I still want to see if an oil cooled GSXR head can be swapped in ...

[jnimbostratus]

What is the benefit of a gsxr head? Any specific years?  Maybe after i get my parts from you i will ebay a gsxr head. My buddy has a chopper with a katana motor in it and i believe the oil burner gsxr heads are a kat upgrade so i could prob offload it to him if need be

[fj1289]

As far as I know, the oil cooled GSXR head has the best ports for any air cooled engine and with the cam chain in the center.   Plus there is still a good number of shops and tuners that still know how to make large improvements to them.   I have no idea if it could be made to work on an FJ or not.  First is if the bore centers are close enough, how close are the cylinder studs, and what length the can chain will need be?  On some of the Suzuki GS motors they swap these heads on they have to move the cylinder stud locations in the head. 

[jnimbostratus]

Well everything should be coming to a close soon then i can get in the new shop and start my winterbuild. I am starting to really go crazy not having a shop. So i put together my winter rebuild objective list.

1450 kit.

port/polish head

Upgrade valve springs

Adjustable cam gears

Manual camchain tensioner

Upgraded cylinder studs

Redesign exhaust system for better flow and ground clearance

External waste gate

Mandrel bent and welded intercooler pipes

undercut tranny.

Upgrade/oversize oilcooler w/efans

Properly setup some sort of pcv w/catch can

E85 (gas station down road from new house has e85 pump)

Coil spring clutch conversion

Those are the definate plans.



Here are the ones being considered but not committed to getting done this winter. Btw i welcome thoughts on any of this

Usd forks

Repaint everything

Upgrade swingarm (singlesided strong enough for 400hp+ ?)

Electronic waste gate

Upgrade from micro to megasquirt to incorporate traction control

A/r .48 exhaust housing on turbo

Ditch the itbs and build all new plenum to use single tb.

Upgrade connecting rods.



Im sure im forgetting a number of things. I just cant wait to get back at it an get my momentum going. Once i get back into it the updates will be plentiful and i will be eagerly awaiting feedback

[racerrad8]

Manual camchain tensioner - WHY

Upgraded cylinder studs - WHY

Upgrade connecting rods - Here is the stronger Yamaha 1250 Connecting Rod.

Just my opinion, but I think I have a pretty good track record building fast & durable engines. FJ Land speed racer

The manual chain tensioner is not needed, the stock tensioner works perfectly. And you never have to worry about adjusting it...ever.

The horror stories of upgrades studs include: frequent breakage of the stud, pulled threads from the case, broken cases and severely distorted heads at the bolt holes.

Randy - RPM

[Pat Conlon]

Randy, I know XJR rods are good, but would they be good enough for a turbo motor?
Wouldn't Carrillo A beams or H beams be stronger?

Re: Barnett coil spring conversion, the stock kit comes with the 75 lb gold color standard springs which will be too light for your application.


At least get the 82 lb green springs:

http://rpmracingca.com/proddetail.asp?prod=Clutch%3ASpringHD

The greenies are a tad shorter so you will need to shim them.

If that does not hold her....Barnett also makes red 90 lb springs you can always move up to....
I suggest a 14mm clutch m/c for these heavy springs. I have the greens on my 1380 and they hold just fine.

Re: 1450 block, make sure you have good cooling fins!
APE made a 1450 Gorilla billet block which was fine for drag racing, not so good (at all) on the street.
Curt Andrews makes a 1412cc kit using a sleeved XJR block which should have good cooling.
http://andrewsmotorsports.mybigcommerce.com/yamaha-fj-fj1100-fj1200-xjr1300-1412cc-84mm-ross-piston-cylinder-kit/
At 12:1 compression you will need to cut those 84mm piston domes down to lower your compression even with using E85 fuel

Cheers

[jnimbostratus]

Nice. Some good upfront info. So randy i should stay with factory studs? The tensioner i just assumed to replace cuz i have had one fail on a cbr600f2 (common problem) and had one come failed on the fzr600 motor i put in my atv. If you say its a good piece then great, money well saved. And as for clutch springs i will most likely go sever duty and use a stock larger bore master cylinder from another bike (ebay). Appreciate the input fellas.

[Pat Conlon]

....and use a stock larger bore master cylinder from another bike (ebay).

Negative, you are going the wrong way.
With stiffer clutch springs you want a m/c with a smaller bore for an easier squeeze at the lever.
The stock FJ clutch m/c is 16mm or 5/8" dia. So you want a smaller 14mm bore m/c for those greenies.

[jnimbostratus]

Haha yes thanks pat not thinking clearly. My brain had it right but my fingers cant keep up. I was even thinking to myself "do i still have that nissin 14mm master from that cbr?"

[aviationfred]

Haha yes thanks pat not thinking clearly. My brain had it right but my fingers cant keep up. I was even thinking to myself "do i still have that nissin 14mm master from that cbr?"

The Nissin masters from the Honda's work great. I have ran masters from a VFR800 and an RC51 for awhile now. I have the coil spring conversion with the 82lb greenies. No increase in lever pull noticed.


Fred

[racerrad8]

Randy, I know XJR rods are good, but would they be good enough for a turbo motor?
Wouldn't Carrillo A beams or H beams be stronger?

Re: Barnett coil spring conversion, the stock kit comes with the 75 lb gold color standard springs which will be too light for your application.


At least get the 82 lb green springs:

http://rpmracingca.com/proddetail.asp?prod=Clutch%3ASpringHD

The greenies are a tad shorter so you will need to shim them.

I would use the XJR without any concerns. I was actually thinking of switch over Chris' motor to them when the time comes.

As far as the clutch springs, The green is shorter but they do not need to be shimmed. If you shim them you are increasing the spring pressure. I have never shimmed any that I have installed into peoples race cars.

Randy - RPM

[fj1289]

Two other options for your clutch - double up the stock springs - that's what the guys did for the turbo/nitrous FJ in the first Sport Rider UFO shootout.  Randy suggested trying three! if we needed for the land speed bike.  I opted for the other option - a single stage lockup.  I think you can still get the pressure plate from Orient Express.  They do not have the arms or pins though.  you may be able to source those separately thru MRE or Hays Machine or raid them from a used lockup for another bike.  The lockup will need to be used with the coil spring conversion.  And you will want to have steel buttons installed in the aluminum pressure plate to cut down on the wear - the steel arms will dig into the aluminum pressure plate over time.

Sounds like fun!

[jnimbostratus]

Right now im running doubled diaphragm clutch spring. It dont slip with my current setup but with the extra cubes and port work and most likley upped compression who knows what the clutch will do.