What V8 would you stick in your rx7?
If had to choose a v8 it would be the 4.6l DOHC v8 from the 2000-2004 mustang cobra w/ twin 57mm turbos. here is an ex of this in a 2004 cobra http://www.youtube.com/watch?v=TP9H7QkNjMM this engine is very reliable and strong.as compared to the countless times i have helped a friend rebuild his 2 305's and 3 350 sbc's i hate chevy engines they are cheap and easy to build but you rebuild them way to often and they leak all the time! i even helped him rebuild his 1958 L6 3 times from his 58 apache 36.
the LS1/2/3/6/7/9 motors are nothing like their ancient brothers that you worked on in the past. Leaks? I've NEVER heard of oil leak problems with the LS1. They're now starting to hit the 300k mile mark on some of the corvettes on my forum without rebuilds.
Not to mention the Chevy 305's are junk. Everyone admits it. Why anyone would build one of them up when you can do a 327, or a 346, is anyone's guess.
Good luck fitting that 4.6liter into your Rx7. The motor is MASSIVE. I've had fun watching my friend work on his 98' GT(had a newer Cobra motor with a blower). It's tight in his Mustang(he'd have to do some fabbing to even fit an FMIC!).
the LS1/2/3/6/7/9 motors are nothing like their ancient brothers that you worked on in the past. Leaks? I've NEVER heard of oil leak problems with the LS1. They're now starting to hit the 300k mile mark on some of the corvettes on my forum without rebuilds.
Not to mention the Chevy 305's are junk. Everyone admits it. Why anyone would build one of them up when you can do a 327, or a 346, is anyone's guess.
the LS1/2/3/6/7/9 motors are nothing like their ancient brothers that you worked on in the past. Leaks? I've NEVER heard of oil leak problems with the LS1. They're now starting to hit the 300k mile mark on some of the corvettes on my forum without rebuilds.
Not to mention the Chevy 305's are junk. Everyone admits it. Why anyone would build one of them up when you can do a 327, or a 346, is anyone's guess.
Yes, but there are easy ways to side step it. I'm moving to the panhandle shortly, no emissions or inspection laws there.
whats a Turbo V?
Joined: Nov 2006
Posts: 1,215
Likes: 0
From: Goose Creek, SC
in V8 i would want something DOHC, Audi, BMW, Merc, or a Northstar its a smaller displacment version of the LT5 bu is money no object LT5 no doubt. wait i just noticed the hayabusa V8 FTW!!!!!!!! it looks ike it might have a nice snug fitment into an RX-7
otherwise i would love to have a twin turbo SHO 3.0L V6, maybe a GNX motor
for inline 6 motors a RB26DETT with a corrected oiling system, a B6304F+T,or a N/A ITB 2JZ,E46 M3 motor
inline 5. B5254FT High compression low boost,B5234FT low compression high boost
INline 4 motors: 4G63/4, CA18/20DET,B4204FT,B234FT, B20B+t, D16A1+t(non vtec DOHC),F22C(F20C cams)
otherwise i would love to have a twin turbo SHO 3.0L V6, maybe a GNX motor
for inline 6 motors a RB26DETT with a corrected oiling system, a B6304F+T,or a N/A ITB 2JZ,E46 M3 motor
inline 5. B5254FT High compression low boost,B5234FT low compression high boost
INline 4 motors: 4G63/4, CA18/20DET,B4204FT,B234FT, B20B+t, D16A1+t(non vtec DOHC),F22C(F20C cams)
Darkside FD
Joined: Jan 2004
Posts: 1,175
Likes: 0
From: AZ
The DOHC engines you mention are heavy and HUGE. You should see a picture of a DOHC or SOHC engine next to the LS1. There are reasons why the LS1 is so popular, its size and weight is a big one of those, if not the biggest.
What's funny, is Push-rods are actually a newer design than the over-head cam. 
So when people say ancient technology, they're really showing ignorance on engines.
http://en.wikipedia.org/wiki/Overhead_camshaft
http://en.wikipedia.org/wiki/Overhead_valve
Same as the people who thought the Japanese were the first to have turbos in production cars. It was actually Oldsmobile I believe in the 1950's.
So when people say ancient technology, they're really showing ignorance on engines.
http://en.wikipedia.org/wiki/Overhead_camshaft
http://en.wikipedia.org/wiki/Overhead_valve
Same as the people who thought the Japanese were the first to have turbos in production cars. It was actually Oldsmobile I believe in the 1950's.
doesn't it say, in the first paragraph, "the later OHC"?
Not fully understanding your reference, but I didn't read the whole thing since I wasn't that interested in it.
Not fully understanding your reference, but I didn't read the whole thing since I wasn't that interested in it.
The idea of pushrods came after the idea of overhead cam. That's my point. Pushrods are not 'ancient technology', unless you consider the combustible engine in general as ancient.
Original War
Joined: Feb 2009
Posts: 14
Likes: 0
From: nervous hospital south of the city
I posted in another topic about using the parts you have laying around , its simple , a motorplate and sbc , and a powerglide . Now , trying to be original with your build, thats the diffrence . OH ,and My 2 cents is to find the audi R8 power....goodluck . Bob
Junior Member
Joined: Jan 2009
Posts: 40
Likes: 0
From: Houston, Tx
LS1 would be cool, but the old motor in my R1 dyno'd over 900 hp to the wheels. Dyno queens aside, Id put a stroked 3.0l ford turbo I4, twin overhead cam converted. It would sound real close to a bridgeported 13b, and after you smoke the "rotards"
you could giggle when you pop the hood and their jaws hit the ground.
If money was no object, I would put a all aluminium 1000hp twin cam 2.3l turbo ford from the old Rousch indy cars in. But that motor is $7500,(and I happen to know where one is still crated and never installed/raced if someone wants one)
you could giggle when you pop the hood and their jaws hit the ground.If money was no object, I would put a all aluminium 1000hp twin cam 2.3l turbo ford from the old Rousch indy cars in. But that motor is $7500,(and I happen to know where one is still crated and never installed/raced if someone wants one)
Piston Power
Joined: Jul 2008
Posts: 16
Likes: 0
From: Dufur Oregon
If it's not an RX7 anymore, then what is it? I've got a V8 in my RX7, and I need to know what to call it since it's not an RX7 if it doesn't have a rotary. I think I'll call it the Kick *** Blaster.
Steve
Steve
Junior Member
Joined: Jan 2009
Posts: 40
Likes: 0
From: Houston, Tx
A rx7 is always going to be an rx7, just with a different motor. The purists will always deny this, and will always be rebuilding their motors, when we are driving ours.
I loved my 13b, and have to admit, the sounds it made were wonderful, till it ran hot, blew a seal, and wanted to drain my pocketbook for the rebuild.
If you took a poll of all the users here, I bet that if their motor was blown, and they had a choice of swapping motors once or rebuilding every 15k miles, or less, they would convert.
Even the ones who will always deny this, just to save face after all of their flaming of piston motors.
There is a reason why the fd was pulled from the American market, and I guarantee that it wasnt for the way it looked/handled. Warranty work for the blown motors killed their profits, and put them in the red. And that is from the manufactuer, not the public.
I loved my 13b, and have to admit, the sounds it made were wonderful, till it ran hot, blew a seal, and wanted to drain my pocketbook for the rebuild.
If you took a poll of all the users here, I bet that if their motor was blown, and they had a choice of swapping motors once or rebuilding every 15k miles, or less, they would convert.
Even the ones who will always deny this, just to save face after all of their flaming of piston motors.
There is a reason why the fd was pulled from the American market, and I guarantee that it wasnt for the way it looked/handled. Warranty work for the blown motors killed their profits, and put them in the red. And that is from the manufactuer, not the public.
If you're rebuilding your 13b every 15k miles or less, that's on you.
That said, per the thread title, part of the issue I've always had with V8 swaps is the sort of V8 it typically involves—a camaro/corvette motor. It seems out of character with the rest of the car. If it was a an all-alluminum, flat crank, gear-driven, hi revving sort of thing, it would be far more in keeping—but then you're talking bucks, just like a rotary.
That said, per the thread title, part of the issue I've always had with V8 swaps is the sort of V8 it typically involves—a camaro/corvette motor. It seems out of character with the rest of the car. If it was a an all-alluminum, flat crank, gear-driven, hi revving sort of thing, it would be far more in keeping—but then you're talking bucks, just like a rotary.
^what he said. I've never had a rotary blow on me in over 20 years of driving and tracking modded turbo rotaries.
You just have to know what you are doing. I've seen too many people that are too lazy to research mods before doing them and blow em up b/c of their inappropriate mods. I've also seen many people and piston mechanics misdiagnose a problem and just claim that its the engine.
If you are going through them in 15k miles increments, then you need to wonder if the problem isn't something you are responsible for.
I'm not a V8 person but it does seem pretty cool. I've got no issues with the swap but I do prefer my high revving rotary.
You just have to know what you are doing. I've seen too many people that are too lazy to research mods before doing them and blow em up b/c of their inappropriate mods. I've also seen many people and piston mechanics misdiagnose a problem and just claim that its the engine.
If you are going through them in 15k miles increments, then you need to wonder if the problem isn't something you are responsible for.
I'm not a V8 person but it does seem pretty cool. I've got no issues with the swap but I do prefer my high revving rotary.