6 bolt vs. 7 bolt [merged] 6bolt 7bolt 6-bolt 7-bolt six bolt seven bolt

[asdfzxc]

All 6 bolt vs. 7 bolt threads are merged here.
How do I tell if I have a 6 bolt or a 7 bolt?
Will x part from a 6 bolt fit a 7 bolt?
Will x part from a 7 bolt fit a 6 bolt?
Which one is better?
How do I swap my x bolt for an x bolt?

What is the difference between 6-bolt and 7-bolt engines (aside from the obvious - 6 vs. 7 bolts connecting the flywheel )

Is there an advantage over either of the two engines?

Thanks,

-Mike

 

[turboblack2door]

It would be easier to find 7 bolt cams then to wire the 6 bolt cas and cams in

why would i do that since the 6 bolt with have a 6 bolt head (in which i would put the 7 bolt cams in)? Not being sarcastic i just want to got the easiest cheapest rout

 

[Bcam989]

hey im sort of new to the jdm world but im going to be picking up a 95 gst in a couple of weeks from a friend of mine with a blown motor. he would do a swap him self but he doesnt have th time or money so can anyone give me some good sites to check out so engines for a swap? ill most likely be getting new internals for it but some of the jdm sites i have been looking at for motors have seemed sketchy. which ones would you guys recommend.

 

[cruisintalonawd]

Jdmracingmotors.com tigerjapanese.com and meny more go to Google and type in Ecliplise JDM engine

 

[Bcam989]

ok thanks, and i no everyone says that you should really go witht he six bolts if your going to be making a lot of power and i understand that. But im not going to be looking to be making an insane amount of power to begine with most klikely 300 to 350 hp after i get the motor and build it up. so do you think with these not too high numbers a 7 bolt would be safe enough? and im not talking about just a straight stock 7 bolt, im going to put a decnt amount of money into internals.

 

[95TalonOwner]

A stock 7 bolt will handle that with the right supporting mods and tuning.

 

[cruisintalonawd]

for a lil bit more or maybe the same price you can get a 6 bolt and if you get to that 300 to 350 hp and you wan more then the motor wil for sure handle it though.....think of it that way

 

[emoguitarboy]

Ok so I'm getting my plans together for a motor rebuild. I was wondering what the best motor to build would be.

I've heard a little bit about the 6-bolts being stronger (less possibility of crankwalk) but if I'm not mistaken can't I use a stronger Crank (I'd like to keep the engine a 2.0 and just build it for high RPMs) Where would I be able to pick up one of these?

Also what the difference between the 6bolt long block and short block?

Thanks all.

 

[snowborder714]

Obviously the 6 bolt is a better engine, but crankwalk is way overrated, especially on a freshly built engine.

And the difference between a long block and a short block is the head. The long block includes the bottom end and head, whereas the short block is just the bottom end.

 

[emoguitarboy]

Oh, thanks for the definition on the long block v short block.

What I was looking for is why the 6-bolt is better than the 7-bolt? I've heard you can get more power out of the 7-bolt.

 

[19Eclipse90]

No. Any 6 or 7-bolt motor can be built up to similar crazy power levels. 7-bolt motors have a greater tendency to crankwalk.

 

[emoguitarboy]

Ok, so what would I need to do to avoid crankwalk. I know I've heard a local builder (Jack) has a cure for crankwalk so when I get ready to build I may just take it by there to have that done, if i can build the 7-bolt for similar/less price than a 6-bolt.

 

[19Eclipse90]

I'm not completely sure crankwalk can be avoided. If everything is in spec, than of course it shouldn't happen; it's when play in the crankshaft, etc. falls out of spec that you get problems There are a number of people here that will tell you crankwalk is highly overrated, and to just build your motor without looking back. It's whatever you want to do. Do a search and read up on it. I know there are plenty of threads to read.

 

[snowborder714]

As far as I know, there's nothing you can do that will definitely keep your engine from crankwalking. Any engine has this possibility. It's just the 7 bolts are more likely to have it done (but even still, it's very rare that it happens.) If you can't find a 6 bolt, don't want to go though all the extra steps to do a 6 bolt swap, or are doing this on a tight budget, just stick with the 7 bolt.

And as for your local guy knowing a cure, I'd be kind of leery. This quote by Defiant sums it up very well:

Until the cause of crankwalk can be determined, a "cure" is equally ethereal.

 

[emoguitarboy]

Well my plan is to build my car with less money and a smaller turbo to overtake some of the faster cars out here. Plus I like the idea of building a 7-bolt, cause I don't hear of a lot of people doing it.

 

[DsmDave95]

You sound like a noob,all of the ?s you have just asked there are multiple threads about instead of searching you make this useless thread. theres no such thing as being cheap im my eyes you have to set out a goal and there are steps you take to reach that goal it all depends on what you wanna make the car for street, track etc. please stop making useles threads,
thanks
-Dave

 

[Twistaye]

Man, in all honesty, I'd go ahead and stick with a 6 bolt swap. If you're ganna go ahead and build the engine, then why not build it right? You can pick up a 6 bolt for about the same price as a 7 bolt all day long. The 7 bolts are more likely to crankwalk, yes, but it's still a rare occurance, and a chance you're ganna have to decide if you're ganna take or not. Personally, the way I see it, if you set out to do something, why not do it the right way the first time? If you have a way to pretty much avoid crankwalk (6 bolt), then why not go ahead and take that route? It's all in the preference of the builder. In all honesty, I have 140k on my 7 bolt, and I have no problems out of it whatsoever (after I fixed all the previous owners mistakes^^). Been driving my car since 80k miles and only had to do maintenance on it. Currently building a 6 bolt to go into it. Sorry I type too fast for my own good, I end up writing more than I should. Basically, do it right the first time, so you don't have to do it right the next time^~

 

[pitbull419]

Crankwalk is not because of the crank. It has to do with the bearings.
Again ANY engine can crank walk.
If its cheaper your looking for just build the 7bolt.
Do a search there are TONS of threads that will have more information than you will ever need.

 

[pj91gsx]

Are forged pistons and rods universal for 6 bolt and 7 bolt motors.

 

[allwheelTSI]

No, they are not.

 

[TermTrky]

OEM pistons for my '92 4G63 will only fit '90 - '92 supposedly. Lookup part numbers for a 7 bolt forged rod / piston set & look up numbers for a later 6 bolt.

 

[pj91gsx]

ok. but I know that 2g pistons can be put on 1g rods.

 

[allwheelTSI]

ok. but I know that 2g pistons can be put on 1g rods.

Correct, though it takes machining of the rods to make them fit.

 

[pj91gsx]

ok. do you know if how much it cost for the machining? I was going to put 2g pistons with 1g rods in my friends rebuild.

 

[allwheelTSI]

ok. do you know if how much it cost for the machining? I was going to put 2g pistons with 1g rods in my friends rebuild.

Probably fairly cheap, I have never had it done personally, though I am my own machinist.. I believe the rods only have to be bored 1mm oversize to accommodate the bigger wrist pin of the 2g piston.

 

[91gsxdriver10]

will 7bolt piston/rod combo fit a 6 bolt crank at all or will there be machining required