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

 

[95TalonOwner]

You can use 7 bolt pistons with 6 bolt rods but you still need the rods machined to accept the pistons.

 

[6 bolt dreams]

I have a 1990 eclipse gs turbo and a 1993 g/s none turbo. My problem is i don't know if i should pull my turbo engine out of the 90 and stuff it in to the 93. The 93 has the 7 bolts on the flywheel where as the 90 has the 6 from what i understand is the better of the two weather its boosted or not. Right??, i think?? I more or less want peoples opinion what body everyone thinks is nicer. Also should i put the 6 bolt engine i got in place of the 7 bolt? Neither of the cars are my daily drivers so times not an issue ill try to get some pictures up tomorrow.

 

[Rob10_99]

Is something wrong with the 90? like a train cutt off the rear of the car?

 

[1stgendon]

They both have good bodys to me. Im runin a 90. Ive been told the 1st gen r faster. Im not sure thow thats just what i've heard, beef up the 90.

 

[6 bolt dreams]

the 90 needs a head

 

[6 bolt dreams]

and i kinda like the 93 style better im just lookin for sum input

 

[spooled_u_1st]

Build the 90 and put in a 4 bolt rear.

 

[93clips]

is the 90 a gsx or a gst? the difference is awd or fwd. If its a gsx i say build the 90 and have the 93 as dd. but if its gst the swapping it into the 93 wouldnt be a bad idea (IMO the 93-94 look nicer).

 

[95 tsi]

What is the differnce in the arp head studs in a 7-bolt in comparison to a 6-bolt eng.
I am currently doing a swap in which i was installing a 7-bolt eng into my 1g eclipse.
I purchased head studs for a 6-bolt a while back and figured they would work however they are too short??

 

[ctcare89]

I'm sorry I don't remember which is which, I can look it up if you want, but I know between the 7 bolt and 6 bolt head, one bolt is 11mm and one is 12mm.

Someone correct me if I'm wrong.

 

[cruisintalonawd]

Your right that one is bigger then the other. The 6bolt is the smaller one.

You have to have the 7bolt head studs

 

[DJYoshaBYD]

Why would you swap a 7 bolt in place of a 6 bolt? That doesnt make sense.. Crankwalk is the 7-bolt's favorite thing..

 

[meliketoball]

Why would you swap a 7 bolt in place of a 6 bolt? That doesnt make sense.. Crankwalk is the 7-bolt's favorite thing..

Crankwalk is overrated.

 

[talon4show]

I'm sorry I don't remember which is which, I can look it up if you want, but I know between the 7 bolt and 6 bolt head, one bolt is 11mm and one is 12mm.

Someone correct me if I'm wrong.

Other way around, 6-bolt uses 12mm while the 7-bolt uses 11mm

 

[DJYoshaBYD]

haha.. overrated? I dont get it.. Its not like people want it, and I can name 10 people on here just off the top of my head that suffered from this problem.. the only benefit of the 2g swap is the head, and you can just swap the head on the 6 bolt, just like all those cats do in their 2g's.. The 6 bolt may have a slightly smaller crank, but it makes up for it by being more reliable and having bigger rods than the 7 bolt.. .. big rods are good when you are boosting the hell out of your car.. Crank walk may not happen, but how much would it suck if it did?

 

[92dsmtalon]

haha.. overrated? I dont get it.. Its not like people want it, and I can name 10 people on here just off the top of my head that suffered from this problem.. the only benefit of the 2g swap is the head, and you can just swap the head on the 6 bolt, just like all those cats do in their 2g's.. The 6 bolt may have a slightly smaller crank, but it makes up for it by being more reliable and having bigger rods than the 7 bolt.. .. big rods are good when you are boosting the hell out of your car.. Crank walk may not happen, but how much would it suck if it did?

I fail to see how the 7 bolt head is better? I am putting a 6 bolt head and intake manifold on my 7bolt block...The 6 bolt has much bigger ports, which obviously means better airflow, and with better airflow, comes a better running turbo...So, the 7 bolt head is not better.

 

[DJYoshaBYD]

I have heard of people swapping the heads, but I may have my parties muddled.. My bad..

But that re-enforces the fact that the 6 bolt is far superior to the 7 bolt.. bigger head ports, better flow, bigger rods, better built...

There would be no reason to downgrade a car that came with a 6 bolt, to a 7 bolt.. That is what I am trying to get at...

 

[cruisintalonawd]

Its overrated because not everyone will get crank walk. I've heard or people having it in a 6 bolt

 

[92dsmtalon]

I have heard of people swapping the heads, but I may have my parties muddled.. My bad..

But that re-enforces the fact that the 6 bolt is far superior to the 7 bolt.. bigger head ports, better flow, bigger rods, better built...

There would be no reason to downgrade a car that came with a 6 bolt, to a 7 bolt.. That is what I am trying to get at...

Yeah, I figured you got them mixed up, but yeah, the 6 bolt is FAR better than the 7 bolt...If I had the time and money, I would most definately do a 6 bolt swap, but, a top end 6 bolt swap is the next best thing I suppose.

 

[DJYoshaBYD]

Its overrated because not everyone will get crank walk. I've heard or people having it in a 6 bolt

true true.. You can get crank walk in any motor.. But the 7 bolt is just more susceptible to it...

 

[rarson]

I'm one of the people who feels the 2g head IS better than the 1g head, because the 1g head ports are TOO big. They're also pretty much flat until you get to the valve.

It'll be a never-ending argument as to which is ultimately better, but power can be made with both, and the 2g head can always be ported to the size of the 1g. I'm running 11's on a small 16g and stock 2g intake manifold and head, so it can't be THAT bad (cams are the key).

Port size is a compromise between flow and velocity. Bigger isn't always better.

 

[turboblack2door]

Why would you swap a 7 bolt in place of a 6 bolt? That doesnt make sense.. Crankwalk is the 7-bolt's favorite thing..

Some of the 1g's have 7bolt also. the 92.5 start the 7bolt revolution but those are stronger than the 2g 7bolts

 

[92dsmtalon]

I'm one of the people who feels the 2g head IS better than the 1g head, because the 1g head ports are TOO big. They're also pretty much flat until you get to the valve.

It'll be a never-ending argument as to which is ultimately better, but power can be made with both, and the 2g head can always be ported to the size of the 1g. I'm running 11's on a small 16g and stock 2g intake manifold and head, so it can't be THAT bad (cams are the key).

Port size is a compromise between flow and velocity. Bigger isn't always better.

Wow, I know we are all entitled to our own opinions, but wow, I really have to disagree with that...The bigger the port, the more airflow, with more airflow you have a more efficient, more h/p capable turbo.
how could the ports be "too big"?

 

[JeffGST]

Why would you swap a 7 bolt in place of a 6 bolt? That doesnt make sense..

His 1G came with a 7-bolt from the factory. He didn't swap it in. That's why it makes sense.

May 92+ 1G's are all 7-bolt motors.

 

[DJYoshaBYD]

When did he say he had a 92? I must have missed that post... Thats why I said "swap".