Stevo6667

Ok Im new at this and need some help! I dont want to go with a rotary motor. I want to go with a 4cylinder motor, but which one should I go with...Id also plan to turbo this motor later...was thinking about 1st Gen TSi, GSX, GST motor....??? Suggestions? Opinions?
Thanks,
Steve

Musada

not something i would really recommend.....

1987RX7guy

iTrader: (3)

If you're going to destroy the car you might aswell go with 8 or more cylinders.

A wimpy four banger isn't any justice for a 7.

Musada

lol..how about a turbocharged LS1

1987RX7guy

iTrader: (3)

That is atleast worth the effort of doing it, and likely won't disappoint.

SChema

I have seen a 7 with an SR20 in it, I don't know the performance gains, if any; but it fit pretty nice with plenty of room for a bigger turbo.

evileagle

iTrader: (1)

You will spend FAR FAR FAR more money than your car is worth trying to put in some 4-banger motor that was never designed for the car. Just go buy something that already has it.

Also, probably the wrong place to be asking this question

stilettoman

iTrader: (1)

"Also, probably the wrong place to be asking this question "

Well, if "Other Engine Conversions" is not the right place, what is???? This seems to me like the right place.

Don't pay any attention to those purists who tell you it is sinful to take the rotary out of your RX-7. These are the people who have never done anything creative and do not have the skills to undertake such a project.

One of the best choices is without a doubt the Sylvia motor, and you will find other threads discussing it on this forum. The Nissan Sylvia SR20DET is one of the most bulletproof engines out there. It can be turbocharged to about 400 HP with bolt on pieces, and without need to dissasemble the motor, install forged pistons, special rods and other exotic parts. It is not cheap, but it is readily available if you do some research.

The car shown at this post is running now and is really fast:

https://www.rx7club.com/showthread.p...&highlight=bmw
(See response #10)

Musada

actually was planning buying just another 7 body and putting a 350 in it.....sin......the flesh is weak

vspecpgt

yea i would definitely reccomend a v-8 over the sr20... you can make as much power as you want with a v8, and the torque... wow.... i was driving my dads SL 55 this past weekend, and man, just moving from a stoplight is incredible.

GDJ

If you want to swap a 4 cyl engine in there, the SR20 is probably the best choice. However, it costs as much as a V8 swap, and the V8 will have more potential, no matter what. You can build a high pressure SR20 but the life will not be as long as you think.

In my opinion, if you are thinking of swapping in a 4cyl engine, you might as well stick with the rotary. The V8 is the best option though.

xtremeskier97

It wasn't originally in this section..just so you know

capn

best four plug IMHO is the FC20 s2000 engine a 2.0 or 2.2 pushing 240 hp is pretty damn impressive and a screaming high 9,000 reciprocating engine is something to be proud of. and with a turbo you'll be flyin!!

LETHAL RX7

iTrader: (1)

How about you buy my 2jz gte i am selling... that will be nuts. i was going to do it but all my projects are on hold now for a while.. let me know if you are interested. GTpoweredCORRADO@aol.com
Greg

outlawdsm

S2k motor is garbage compared to a 4g63 or sr20. Trying boosting a s2k motor and see how long it lasts, plus its an anemic, torqueless, torture to drive. I have driven several s2000's all of which were huge disapointments.

capn

wow your a moron, you really have no appreciation for technical wizadry do you?

and im sure the 4g63 is so great with all the crankwalk, and comparing a SR20 to a F20c is pointless one is turbo, ones not. and when did performance ever be about reliability im sure a boosted F20 would last the same as a boosted SR, its all in how you drive.

if you thought the S2k was a disapointment to drive then you weren't really driving it, its made for twisties and track racing where youre in its screaming high rpms all the time where you actually make use of all the power.

and look at this, a turbo S2K which puts out 400hp, and what about the cover car for superstreet last month or so, it had 800 some odd HP! Now any other 4 cylinder with comparitive horsepower will last about the same, so reliabilty shouldnt even be considered when it comes to hopping up a motor.

outlawdsm

are you ******* serious? how is an open deck aluminum block good for power? You have to sleeve it to make it able to handle any real power. you think a boosted f20 will last as long as a boosted sr20? your a fool, the sr20 is boosted from the factory and able to handle lots of hp with out even touching the motors internals. People have made OVER 1000HP on a stock 4g63 block, thats right no sleeves, no block gaurds. if you think a s2k motor is even in the same class your wrong, like you said, its N/a and the 4g/sr is boosted.

"reliabilty shouldne even be considered when it comes to hopping up a motor" your truly an idiot if you think that way, but then again, what else should i expect from your typical honda toooneR. go back to reading Super Street to get your technical know-how.

gnx7

iTrader: (10)

That turbo S2000 motor made a theoretical 800hp. It wasn't tested at that time yet.

4G63 motors have been 8's with stock block/crank and upgraded rods, headwork, and the other supporting mods. Impressive.... yes!

There is an SR20 powered FD with turbo running mid 10's@125mph+. It may have nitrous... but it does rip.

A stock block LS1 with ported heads/cam and headers with good tuning should match those numbers. Throw a 100 or 150hp nitrous shot on top and it would be no contest.

Draft up a budget and see which one is more feasible in the long run. The LS1 will certainly have the capability to support much more HP down the line and will have more torque due to displacement. The stock block/crank has made over 1000rwhp in many applications without failure.

Remember that torque is what pushes you back in your seat...... not HP.

outlawdsm

agreed, an ls1 will equal more power potential than a 4g63 or sr20, because of larger displacement.

capn

ok i'll go back to my books for more technical Info,



and don't go accusing someone of being a ******* ricer until you know them.

GDJ

Wow somehow I missed the VTEC chapter when I took Chem 100 and Math 99.

digitalsolo

iTrader: (2)

You know, the arguing here is unneccessary, but Capn, a good point is being made. The F20C just isn't built to take high power levels well. Yes, it CAN be done, but at what reliability and what cost. You can put a 2 rotor into the ~1000 HP range, that doesn't make it a good idea.

Precalc eh? Just wait till you take multi-variable bullsh*t.

outlawdsm

i take precalc. so i must know EVERYTHING about EVERYTHING. good to see you couldnt come up a legit response.

capn

i dont like those differential equations too much, but yeah at least you can see my view here it can be done, but even when i say that, i said you shouldnt look at reliability because how is it ever going to be reliable with so much HP.

but whatever