6 bolt and 7 bolt motors

[cwriley]

ok i i know this probably a noob question so imma get it out the way, whats the difference between the 6 bolt and 7 bolt 4g63 motors?

originally my car had a 7 bolt and when i bought my new motor it was a six bolt, i had to change flywheel and clutch but everything else seems the same power wise.

 

[94_TSi]

6 bolts have 6 bolts on the crankshaft to hold on either your flywheel or flexplate, 7 bolts have 7. 6 bolts came in 90-mid 92 dsm's 7 bolts are from then to 99.

 

[magicgadget]

7 bolt motors are more susceptible to crankwalk than 6 bolt motors. 6 bolt motors also have bigger and stronger rods than 7 bolt rods.

 

[nickblackgsx]

There is tons of info on this site... But the heads are different, 6 bolts use different Cam angle sensors. Look up a 6 bolt swap for a 2g

 

[greyspyder117]

7 bolt motors are more susceptible to crankwalk than 6 bolt motors. 6 bolt motors also have bigger and stronger rods than 7 bolt rods.

I am one to believe this but others question this "myth" I am talking about the crankwalk...

 

[FLASH1970]

In 98-99 the 7 bolts had a thrust bearing upgrade to a split design like the EVO's and are about as likely to crankwalk as a 6 bolt. The 7 bolts from 92-94 still had the 1g head and intake manifold. Also, the 2g 7 bolts have the crank angle sensor. I'm not sure if the 1g 7 bolts have that sensor or not.

 

[9!'clipseDOHC]

Here is 35 pages of everything you would ever want to know (and probably an aweful lot that you don't want to know) about the differences between and how to tell if you have a 6 bolt or a 7 bolt.
http://www.dsmtuners.com/forums/newbie-forum/4626-6-bolt-vs-7-bolt-merged-6bolt-7bolt-6-bolt-7-bolt-six-bolt-seven-bolt.html

Hope this helps!

 

[91Bomb]

1g 7-bolts aren't known to crankwalk (april '92 -94 1g's)

 

[nickblackgsx]

There is tons of info on this site... But the heads are different, 6 bolts use different Cam angle sensors. Look up a 6 bolt swap for a 2g... Intake manifolds are different.. Throttle bodies are different

 

[9!'clipseDOHC]

There is tons of info on this site... But the heads are different, 6 bolts use different Cam angle sensors. Look up a 6 bolt swap for a 2g... Intake manifolds are different.. Throttle bodies are different

You are talking about the differences from a 1g to a 2g. Not necessarily the differences from a 6 bolt to a 7 bolt. For instance the 1g 7 bolt (mid '92-'94) has the same head, intake manifold, throttle body, and cam angle sensor as its 6 bolt counterpart.

 

[Tanro]

Any motor can crank walk. The seven bolts that were "prone" to it was because of a bad thrust bearing design. It was updated and the 97.5-99 motors were much less prone to it. It was really only an issue in a very small amount of 7bolts. If yours has over 100k on the clock and still has the old thrust bearing design it more than likely will not be crank walking anytime soon.

FYI I have seen a couple of crank walked hondas IRL. A Cranked walked 95 dsm, crankwalked 96, and a crankwalked 91.

The main differences are smaller rods, thrust bearing design, and number of bolts on the flywheel.

There rest really branches out into 1g/2g stuff.

 

[vannaksgsx]

If you havent already felt the heat, let me tell you right now...

You're gonna get a verbal spanking everytime you ask a question that has been answered 100 times already. Is it easier if the answer comes to you? Absolutely. But the more you search, the more you'll read, the more you'll learn.

I don't know about everyone else, but I'm sick of reading what I'm writing to you NOW.

Welcome to the site. Get rid of that body kit. jk. no im not. jk

6 Bolt exhaust manifold prone to crack. Some tuners will swap for a 2G Mani. Correct me if I'm wrong...

 

[9!'clipseDOHC]

6 Bolt exhaust manifold prone to crack. Some tuners will swap for a 2G Mani. Correct me if I'm wrong...

That's another 1g thing, not necessarily a 6 bolt thing. 1g ('90-'94) exhaust manifolds are prone to cracking, this includes 1g 6 bolts ('90-mid '92) and 1g 7 bolts (mid '92-94). Yes the 2g manifolds are a direct bolt on though. I run one on my 1g 6 bolt.

 

[Gost Rider]

wow im new to thw site a me and my lab top had a lot of alone time on the 6 bolt swap subject and it helped out alot all i have left now is timming the car but i dont know how and dont want to try

 

[SpawnedX]

TLDR;

If you listen to the people on this site, they will make you believe that every 7 bolt motor crankwalks. They will also immediately diagnose every problem, mundane and major as crankwalk and 99% of the time, if not more, is not crankwalk.

Facts:

- Less than 2% of all 7 bolts sold and were serviced for engine problems at Mitsubishi had actual thrust bearing play (the real name of crankwalk).

- 6 bolts and 7 bolts can be differentiated by their oil pans.

- 6 bolts and 1G 7 bolts have a better oil squirter design.

- 6 bolts have 6 bolts on the flywheel to the crankshaft and 7 bolts have 7, I know amazing how simple that is.

 

[cflaherty3]

I have a '95 4g63 block and know they are most prone to crank walk do to a improper wear or stress on the thrust bearing. I've been told that a typical machine shop could do the work to make it carry the thrust bearing design of the newer stronger '97-'99 7 bolts is this true and does any one have a picture of the difference in the two so i can see myself!