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Piston Engine Conversion Have you replaced your rotary with a V8 or any other type of piston engine? Tell us about it!


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Old 08-23-2012, 11:30 PM   #1
85turbo12a
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Default My lexus v8 FB build

After 9 years in the rotary game and 8 years owning my 85 FB and tired of the problems of turbo rotary engines....im doing the dirty deed and puting a v8 in the car...but not just any ol cookie cutter ford/chevy everyone else has one engine, my weapon of choice is a 4.0L DOHC all aluminum 1uzfe lexus engine....turbocharged....

the build is not yet complete, I am trying to get it done, running and tuned by around january because i want the car well tested so i can go to DGRR2013, i went in 2011 with my turbo 12a and had a blast, this time with MUCH improved low end torque...it should REALLY be interesting..

now for some pictures...this is the car at DGRR2011, my little turbo engines last hoorah!
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Old 08-23-2012, 11:50 PM   #2
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this is my facebook album where i log progress, im using the turbo2 transmission adapted to the 1uz, using the T2 flywheel, clutch and pressure plate, starter is from a V6 camry, adpated to fit.

http://www.facebook.com/media/set/?s...5200620&type=3

basic info
electromotive tec3 engine management
ford 8.8 rear
re-speed steering
mildly modified gen2 camber plates to work on FB...ok not mildly...but im a machinist so it was free....hehehe
as for turbo(s) still on the fence with using twins or a big single...im leaving that to fate after the engine goes back in the car for finishing/plumbing then ill decide what fits best...not much room...yall know that..

now as far as i know...I am the only one in the USA to do this particular conversion...the only other 2 gen1s i found a trace of were in new zealand...neither were turbocharged.
if anyone else out there was as determined as I am to make it fit and finished one i would love to see pics and info on it.

and BTW its under the STOCK hood, no ugly cowl, its requiring me to shorten the oil pan/pickup...but thats a small price to pay for sleeper status. and it looks better...you wont be able to tell from the outside its a converted 7, and it will be pretty quiet as well....

fun facts, the 12a complete with turbo and oil cooler, weighed 375lbs, the 1uzfe with all accessories i will be using, minus a turbo, weighed 405lbs. i figure by the time its all done, with the changes i have made to the steering, rear end, cooling system and plumbing the car will MAYBE gain 80lbs, if that. and balance "should" remain the same, I will deliver the facts of that when its done and i can weigh it. though i never got a chance to weigh it before hand, i can give and end result and compare to existing rotary cars of similar specs as mine was.
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File Type: jpg 1uzfe 002.jpg (151.6 KB, 106 views)
File Type: jpg steering2 003.jpg (103.9 KB, 51 views)
File Type: jpg 1uzfe 001.jpg (81.8 KB, 32 views)
File Type: jpg 578652_4333937077357_1676443305_n.jpg (46.0 KB, 51 views)

Last edited by 85turbo12a; 08-24-2012 at 12:02 AM..
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Old 08-24-2012, 12:14 AM   #3
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stay tuned...engine build and plumbing coming soon.
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Old 08-24-2012, 08:43 PM   #4
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the goal of this project is to build something no one else has, and I think i pretty much nailed that...the technical goals are to have at or slightly over 500whp, with the accompanying 400+wtq, have a cruising MPG of nearly 30mpg and a top speed north of 200mph, <--though I am not really willing to risk my car or my life to try it...car is sketchy above 150 with no aero mods....been there done that...

I had to shorten the T2 trans shifter location by 4 inches to push the engine back, resulting in an interesting mod to the shifter housing and new aluminum Xmember and body mounts.

the RE-speed Xmember had to be shimmed down 3/8, and lightly modded for the motor mount set up, offset bushings lower the rack as far as possible, I also added a 1" rectangle tube to the bottom of it to aid in a strike point to guard engine from road impact, also with provisions for armor plate sump guard, sump has to be shortened 1 inch, but i will make up for the loss of oil volume with the dual external filters and large oil cooler, engine holds 6 quarts originally with small filter and no cooler.

had to relocate the brake proportioning valve to the strut tower to clear the valve cover, pretty easy job.

all this work resulted in being able to close a stock unmodded hood over this tall ass engine and without cutting any sheetmetal on my precious little car.

the choice to use the T2 trans is simple...cost, i already had a forged steel flywheel and nice ACT clutch/pressure plate capable of the HP intended so since i did all the adapters myself for free, all it cost me was about 25 bucks for some special hardware, and then bout 100 bucks for a brand new camry starter since the T2 starter lacks the testicular fortitude to roll over a 4 cam v8, as for the strength of the t2...we shall see, they are pretty tough, my 12a made a good 400+ and i beat it like a stepchild, trans still works and sounds perfect.
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Old 08-24-2012, 11:00 PM   #5
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Very neat, you're a talented machinist. Can't wait to see it in person.
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Old 08-25-2012, 09:29 AM   #6
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Nice! Keep it up. I can't wait to see some videos.
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Old 08-25-2012, 11:15 AM   #7
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I can dig it
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Old 08-26-2012, 08:48 PM   #8
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now to pose a question for the more knowledgeable people out there regarding transmission speedometer gears in the T2.

right now my final ratio is 3.90 in my 8.8, i chose to stay with stock ratio for speedo purposes when i had it built, but now due to the engine combo, i want to change it to a 3.08 to achieve the top end and cruising MPG desired, but i would love to be able to maintain my correct(ish) speedo reading, so I am wondering if anyone has discovered an over the counter solution to ratio correction or do i have to just figure out how to make said parts?
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Old 08-28-2012, 12:17 PM   #9
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Interesting project.
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Old 08-28-2012, 10:21 PM   #10
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interesting is what my ultimate goal is...i love my 7 and want a special engine for it, LSx engines are nice but boring no matter how fast...everyone has one these days...wankels are finicky, delicate, expensive and hard to find parts for...so its time to move on to more reliable means of propulsion, tired of my car sitting in the garage instead of on the road.

most of my time on this project has thus far been spent on chassis mods, the RE-speed steering was ALOT more of a job than it should have been, there were some fitment issues i had to correct, and some parts that didnt work at all..but its all together now and im looking forward to driving the CAR more than the engine combo, i added bigger sways front and rear, hope the rear doesnt become too fishy...otherwise ill put the stock bar back on it, me no want to put car in tree...no no no...7 years without a scratch...and keeping it that way..

mulling over the gen2 brake upgrade, but its not priority right now, the GSLSE brakes work well under 150mph
i kinda want a kamei front spoiler for it...i like the plain outside look, but a front air-dam would help lots...and give me a bit more hiding room for intercooler and such
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Old 09-02-2012, 09:13 PM   #11
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here is the shortened oil pan, the finished/painted trigger wheel and balancer, and the relocated brake proportioning valve to clear the valve cover.
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Old 09-03-2012, 08:36 PM   #12
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You are a machinest well good for you because you can make a speedo gear for the speedo unit,the small gear using nylon.I have done it so you can .The change in OD will change the distance the gears center needs to be from the trans output shaft .Figure the diameter and the differance of the stock diameter and then you will know if you will need to cut the mounting hole from the side of the trans and weld it back in the correct place.You could make a mount and make the hole adjustable changes later .Being a mechinest opens the world to you ,think it out and be proud of what you do .Good skill to you.
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Old 09-03-2012, 11:08 PM   #13
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ya i just didnt want to have to go through all that work, have enough on the plate as it is, i was actually thinking about making a small gearbox and using RC car gears to change the output ratio to what is needed for any given gear, as it sits i might not even have the gear change done by DGRR, so i might be on the 3.90 final still, which will kill my highway mpg but o well
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Old 09-10-2012, 03:21 PM   #14
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smoothed off all the sharp edges of the stock pistons, a FYI for anyone considering this engine, the stock internals of the early 1uzfe engines 89-94, are good for near around 600 crank hp and safe to 7k rpm, its recommended to NOT exceed 7500 rpm due to rod CAP failure, and cam tappet shim issues, since its a shim over bucket design. the early engines have MUCH thicker rods for use in turbo application. the 95+ rods are pencils and will break.

settled upon a twin turbo set up, as soon as i finish assembling the engine and start fabbing plumbing I will post pics of the engine bay, im very anxious to hear what this engine will sound like through the twins and into the big single pipe...there will be no hiding its piston engine-ness from rotorheads....but unless they hear it, there are external clues.

i do still want another rotary...just not a turbo...too problematic...would like a nice NA rx3 or something, really like rx3 SP....cant afford one...
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Old 09-16-2012, 06:55 PM   #15
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got the rotating assembly put together and my turbos came in the mail, now i have to assemble the heads...thats gonna take a while...because someone(me) thought it would be awesome to have a 32 valve engine...
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