warron, where did you get a quote on a billet crank? Because I'm having trouble locating 6l cranks, and would like to someday build 7+ liter motors

 

actually quite a bit. all use the 2JZ engine
most run just 3.0L inline sixes,couple i know have 3.4L stroked,not bored!

the 300hp use twin turbs, 500-1000hp use a single turbo, and any thing over 1000 also are just singles. BIG ONES.

truly an amazing engine, the big boys have made boost over 40psi!
and Supra is an amazing piece, aero has allowed over 250mph without much lift, Toyota out did them on that one, back in 1992-93.

pix some of the cars that are local except TITAN out of Orlando fl. all pix are 5-10yrs old! skyline was in my shop, the build of a RED RX7 intercooler set up flat mount up front, other is my own blue RX7 with water to air I/C back in 1999.

i persnally witnessed one make 1410whp on a dyno. SUPRA.
at 125mph hit the throttle and tires spin car goes sideways, Yup its scary, i have changed since i was young, but not all that much, damn, any time someone gets beside me i start to raise the Adreniline!

hey i can set you up for a run, if you get down around here! LOL,LOL

a shame that a lot of guys on this forum dont appreciate a good street race!

 

cal i dont think you can buy a 83MM,JAG V12, billet crank finished for $2000. USD, i think closer to $3000.+.

would you settle for less than the best quality workmanship, because its cheaper cost??

also i find it odd that you have only a 74.5mm stroke when a stock 6L is 78.5mm,! if you were looking for more cubics?

 

i chose to stroke the stock crank, because i could use a forged crank, at the time i couldn't find a 6 liter crank that was forged, and i wasn't going to build this motor with a cast crank.

the added bonus is i can find new cranks and pay 700 for them to be offset ground and balanced. no sense building something you cant repair if it all goes wrong right?

the joke goes "what do a 300 hp 500hp and 700hp supra all have in common? they all run 10.6 and get embarresed by the hemi next to them."

we build a lot of stuff like that where i work, we just finished up a 700hp supra a month or so back. we reguarly work on a guys R33 skyline RHD import, the owners both have evos one with the lisence plate 800AWHP, and several R35 GTRs which make over 600ish.

cool stuff, but never has really been my thing. Dont get my wrong i think your RX7 is badass, but i wouldnt drive one, just not my fit.

i like big, high horsepower, high cubic inch cars, anything smaller than a camaro, is just too small for me. the shop i grew up in, all we would run was domestic big blocks, and ive seen a N/A hemi make 1000hp on the dyno, and run an 8.4 quarter mile and its a streetable(ish) car.

personally, i feel if you have a jaguar V12, it should be naturally aspirated and smooth crisp throttle response and power. thats why i built mine the way i did. but hey whats my opinion worth anyway

 

hey Ron, how close are you to where they run the Texas 2k? Im going to be there this spring, two of my friends are running their cars, and i want to bring the jaguar if its running in time.

 

I didn't, it was a guess based on what a billet V8 crank costs here in Aus. You can have the journals welded and ground. A guy here in our club did this on his 5.3L crank stroked it to 78mm and used stock Jaguar rods. I don't know if a 5.3 crank stroked to 84mm with 2.1 journals would have enough overlap you would have to check.

I bought my 6.0L engine for 3K (it came from the USA) so you should be able to get hold of one cheaper than that. Be aware that the later 6.0L's had cast cranks.

 

the motors are not terribly expensive, just hard to come by. I've only found 3 in my travels for sale

 

cal, i live about an 1 1/2-1 3/4 hr drive from Hennessy motorsports( that is were the Texas 2K is held), its right on interstate I- 10. west of houston and is flat as a pancake hiway all the way into Houston tx. about 45-50miles, so when the guys are leaving T2K they are all pumped, race like crazy back to houston!

i been a few times, its really a lot of FUN and car talk.

hennessy has about a 2000 acre race ranch, got a 1/4 mile drag strip, a 1 1/2 mile road course, and lots of parking(easy couple thou,).

hennessy is a great down to earth guy met him , one time when i was there with my motorhome towing my RX7, we stayed over night, he came by and had hot pizza at no charge!

check out some of his cars, google hennessy motorsports!

 

6l jags are hard to come by,Ford built them so good they last to long!

most are wreck donors, but there are some engines floating around.

getting just a crank may be difficult, because no one wants to break up an engine for parts.

 

i do agree for a hi-performance engine a forged crank is the way to go!

but FORD has more experience with cast cranks than anyone in the world, they have had good engineering and knowledge, a crank should be flexible,so it wont crack, but have hard bearing jounals so it can last a long time!

 

I've seen a ton of Hennessey cars,
did I ever tell you my uncle was Carroll Shelby's main mechanic back when he was running the cobras on the salt flats?
he was one of the guys who put the wing made from a.dumpster on the gt40 prototype.

 

good news, I found a first class tuining shop, and it is literally in my best friends back yard (300ft beind his house) so we will see if it makes.more than 500bph. I'm hoping with the stock intake it makes more than 400, I've seen much less extensive builds make almost that with ignition and fuel tuning

 

I'll take a early stab at a prediction... I'm thinking from what I know about it at this point it that it makes 445HP early in the RPM range or about 4500RPM

 

that might be the case, I haven't gotten the group A ,Intakes yet. and I want to see tbr actual dyno graph before I do so, so I can see if I gain or lose midrange power. I'm also going to go.with much bigger (approx 3in) throttle bodies from an LS2

 

Have you read Allan's book? towards the end where he dynoed a 6.0L in various stages. The last was to add the intake manifolds from the GrpA car, they lost power below 4000 and did not make more power until after 6500.

I think Ron said it earlier that what the car needs is longer intake runners. I don't think it needs larger TB's The LS guys are making 600hp with a single 90mm and the dual 63.5mm stock TB are the same area as an 89mm. Just profile them correctly.

 

how should I profile the throttles?

 

how would I make the motor have a higher max power band?

 

I would machine a taper to the butterfly, being careful not to intrude too far as to affect butterfly closure. There are bolt holes in the mouth of the TB that need to be covered (Take a look at the AJ6 TB this is poor design, the holes on the edge of the TB will create turbulence). By machining a recess in the mouth of the TB and inserting a bellmouth you will have a smooth entry.

I'll see if I can find my paper on bellmouth profiles and flow.


Air flow in any vessel (AKA air filter box or Plenum) the air on the walls travels slower than the air in the middle. so having a bellmouth protruding into the airbox slightly will increase the velocity through the TB.

 

Here is the flow bellmouth article

 

If you use the XJ6 throttle discs you can open out the std v12 throttle body and fit them easily and cheaply; not as large as the AJ6 Eng units but a very cheap way of increasing size without going too large. Be aware that going larger may make the edge of the butterfly foul the filter and jam open; dont ask!