Jnimbostratus Street Fighter Project

groome · May 28, 2016, 09:29:49 AM

the more i watch this thread the more i fall in love with that bike. awesome build

jnimbostratus · September 28, 2016, 04:38:13 PM

Well. Since my last post a put alot of very fun mileson the bike and then a few weeks ago cylinder 1 rings let go i believe, unfortunately a few weeks before that my father got sick and we had to close our shop so no place to tear her apart. Fortunatly i am under contract to buy a house that has a suitable shop on property so i can assure a rebuild in the relatively near future.

Mark Olson · September 28, 2016, 09:40:39 PM

there ya go, always gotta have a place to wrench on the FJ.

jnimbostratus · October 06, 2016, 08:55:52 PM

I have been looking at these big bore kits on ebay they come pre sleeved and everything ready to assemble i eas told the biggest i could go on my 1100 without crankcase cleanup was 1197. If im going bigger i want much bigger. Is the case modification a precision operation or simply removing material? I havnt had my cases open in a few years now and im struggling to envision it. In a perfect world i would see undameged cylinder bores when i pull it apart and just buy a set of stock bore low compression pistons and just throw more boost at it but all the research i have done could not find such a thing so im considering big bore slightly bumped comp and keep the boost under 12psi. I dont know fellas give me your thoughts, help me remotivate my passion for this bike.

Edit: mybad i reread the email the largest kit without case mod is 1297. i think i may be able to live with a 1300turbo.

aviationfred · October 06, 2016, 09:19:34 PM

I have installed the 1297cc Andrews Motorsports big bore kit. It is truly a drop in kit. I run 91 octane pump gas with no problems and no noticeable increase in engine heat. I have over 7500 miles on the pistons and it runs great.

As far as adding a turbo to it, I would give Andrews Motorsports a call and talk to Curt Andrews about the specifics.

Fred

jnimbostratus · October 06, 2016, 09:46:11 PM

How was the performance increase with that kit? I emailed andrews through ebay asking if low comprrssion was available they responded saying they could mill down the pistons that come with the kit, but if your telling me you are having no additional heat im not to concerned especially considering the size intercooler i am running and the abbility to retard timing under boost with the mrgasquirt.

aviationfred · October 06, 2016, 10:08:00 PM

My engine was consuming 1 quart in 400 miles and was still able to lift the front wheel in a 1st gear roll on using 18/38 gearing. With the 1300 pistons, I can get the front wheel off the ground in 3rd.

Fred

fj1289 · October 07, 2016, 10:49:41 AM

Which cylinder blocks is Andrews using for those kits? For you turbo I think I'd want the Siamese XFR block with the thickest steel sleeves you could find. Along with XJR rods. Build it STRONG and let it eat!

aviationfred · October 07, 2016, 11:45:06 AM

To the best of my knowledge, the blocks that are used in the 1195, 1250, and 1297 kits are re-sleeved FJ blocks.

Fred

giantkiller · October 07, 2016, 12:58:17 PM

1289 was that a typo.xfr? Mine is supposed to be an xjr cylinder.From Hank Scott in my 1350.
I do have an APE block, and a Wisco block. Both are billet aluminum.

fj1289 · October 07, 2016, 04:10:11 PM

Quote from: giantkiller on October 07, 2016, 12:58:17 PM
1289 was that a typo.xfr? Mine is supposed to be an xjr cylinder.From Hank Scott in my 1350.
I do have an APE block, and a Wisco block. Both are billet aluminum.

Yes - should have been XJR block! For the turbo project I'd think the siamesed block would be better than the FJ blocks - just more meat to help hold everything in shape better at higher stress levels.

I have no idea who manufactured the big block I have. The "cooling fins" appear to be mostly cosmetic -- but I'm sure the block is strong as hell! I've done some street riding on it in the past (when it was only 83 mm bore) but not since putting the custom CP pistons in it. Some of the old Kawi and Suzi big blocks actually looked pretty good for street use as well as the drag strip. Can you post up pics of your big blocks?

jnimbostratus · October 07, 2016, 04:41:18 PM

As much as i dont want to im thinking about abandoning this bike. Im looking at a lot of money in parts between the trans and motor and i could build a whole nother project with the turbo and fuel system i have on the fj now. I really love this bike tho, its truly one of a kind now and it has taught me alot but i just dont know anymore. I keep thinking about buying a used engine but how long till that one folds under pressure. Anyone have a old race cut trans for sale? Or a big bore block? I was under the impression the stock bottom was up to the task, mostly just from the physical observation of the girth. Id also luke to do some head work so the $$$$ just keeps stacking.

giantkiller · October 08, 2016, 11:09:35 PM

Quote from: fj1289 on October 07, 2016, 04:10:11 PM
Quote from: giantkiller on October 07, 2016, 12:58:17 PM
1289 was that a typo.xfr? Mine is supposed to be an xjr cylinder.From Hank Scott in my 1350.
I do have an APE block, and a Wisco block. Both are billet aluminum.

Yes - should have been XJR block! For the turbo project I'd think the siamesed block would be better than the FJ blocks - just more meat to help hold everything in shape better at higher stress levels.

I have no idea who manufactured the big block I have. The "cooling fins" appear to be mostly cosmetic -- but I'm sure the block is strong as hell! I've done some street riding on it in the past (when it was only 83 mm bore) but not since putting the custom CP pistons in it. Some of the old Kawi and Suzi big blocks actually looked pretty good for street use as well as the drag strip. Can you post up pics of your big blocks?

I have them in storage. Trying to get my house ready to sell. So I can build my shop/house.
Anyway the Wisco block is a 1380. The APE block is 1450. Cycle world had a small write up of the APE block. Look up fj 1450. The Wisco actually has Wisco machined into the side of the block. I got them off eBay. Really cheap. there is a guy who buys up old drag bikes and parts them out. I got both with the pistons for less than $250 on 2 different auctions. Got the cases and all the miscellaneous parts for just over $100. Both reinforced. One with epoxy. The other was weld build up. But Randy said that the welded one was probably not true. Most likely warped from the welding. Some day In the future I'll have them built.
I found a picture of one on the net but I think it's from a company in the UK.

jnimbostratus · October 18, 2016, 05:58:00 PM

Want to sell one of them big blocks?

Pat Conlon · October 18, 2016, 07:44:25 PM

As far as I know, the largest piston fitted in an XJR block is a 84mm Ross piston displacing 1412cc available from Curt Andrews
http://andrewsmotorsports.mybigcommerce.com/yamaha-fj-fj1100-fj1200-xjr1300-1412cc-84mm-ross-piston-cylinder-kit/

For street use I would stay with the sleeved XJR block for better cooling (deeper fins)
Back in the '90's I knew a guy who had the APE 1450 billet block and while fine on the drag strip, he cooked the engine running it on the street (even running VP fuel)

I am very happy with my 83mm 1380 block (XJR) from Curt Andrews. Randy built the engine and it hauls ass.
What I have discovered is that the Ross pistons are a much better choice for a street bike than the Hank Scott Pro lite Pistons I replaced.

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Jnimbostratus Street Fighter Project