Bare Block 6bolt vs 7 bolt

[Hesh724]

I want to go ahead and get another block and head to start building incase anything happens to my current powerplant. I was wondering if there are any fundamental diffrences between the 6 bolt and 7 bolt block wise. Or is it just the internals?

thanks

 

[Redwidow]

The 7 bolt has a one piece main girdle and the 6 bolt has 3 seperate main caps. Thats the easiest way to tell, but all the head bolt holes on the 7 bolts are 11mm, where as the 6 bolts have 12mm holes

 

[GIRman67]

I can't seem to locate the page anymore but Magnus Motorsports had done a few tests on the 6-bolt vs. 7-bolt blocks and had found that not only did the 6-bolts have a higher iron content in their blocks, but their oil squirters were supplied with oil directly from the pan whereas the 7-bolt squirters wer supplied from the bearings and were smaller as well

 

[Guzman08]

I can't seem to locate the page anymore but Magnus Motorsports had done a few tests on the 6-bolt vs. 7-bolt blocks and had found that not only did the 6-bolts have a higher iron content in their blocks, but their oil squirters were supplied with oil directly from the pan whereas the 7-bolt squirters wer supplied from the bearings and were smaller as well

u should locate that asap. before some "know it all" says thats u should not put up any info w/o evidence....

 

[19Eclipse90]

The 7 bolt has a one piece main girdle and the 6 bolt has 3 seperate main caps. Thats the easiest way to tell, but all the head bolt holes on the 95-99 7 bolts are 11mm, where as the 90-94 six and 7 bolts both have 12mm holes

All 7-bolt engines had the same head bolts, even 1Gs. You are right on the main girdle and main caps, though.

I can't seem to locate the page anymore but Magnus Motorsports had done a few tests on the 6-bolt vs. 7-bolt blocks and had found that not only did the 6-bolts have a higher iron content in their blocks, but their oil squirters were supplied with oil directly from the pan whereas the 7-bolt squirters wer supplied from the bearings and were smaller as well

You may want to read it again. A 1G 7-bolt (the '93 in this link) uses oil squirters similar in style to the 6-bolt (from the main oil gallery as opposed to the main journals in 2Gs) and has the provisions for the oil squirters in the same position as a 6-bolt engine: Magnus Motorsports » Crankwalk Theory

 

[GIRman67]

it's been about a year since I read it, so I couldn't remember exactly. but thanks for finding it I've bookmarked that page now

 

[Redwidow]

All 7-bolt engines had the same head bolts, even 1Gs. You are right on the main girdle and main caps, though.
]

You are completely right. For some reason I was thinking backwards on the 1g 7 bolt. Thanks for correcting me

edited above post to show the correct information

 

[olddsmer]

All in all you should probably get a 6 bolt. They are less likely to crank walk. If you get a 7 bolt from a 2g, you will see the rods are not as beefy. The 7 bolt motors also used 11mm head bolts instead of 12mm.

Regards
Greg

 

[Dsm4lyfe12]

All in all you should probably get a 6 bolt. They are less likely to crank walk. If you get a 7 bolt from a 2g, you will see the rods are not as beefy. The 7 bolt motors also used 11mm head bolts instead of 12mm.

Regards
Greg

The head bolts are EXACTLY the same millimeter.

 

[untouchablecc]

Any of these engines are acceptable

90-92 six bolt
98-99 7bolt
g4cs 2.4l

Stay away from 95-97 7bolts they are most likely to crankwalk.
Not all of them do but historically that is what they do.

 

[trevor425]

also, the oil pans are different as well as front plate/oil pumps.

 

[shift2drift38]

Since we're talking about differences here, I went to buy an oil filter, and was handed a huge round one, last change i had done has the skinny one that the parts store had listed under the 93-94 4g63's...and the 90-92's have one that looks similar to the 2gnt's except not as tall... a little lost, is it possible I have a 7bolt oil sending unit on my 6 bolt block? I know it's a 6 bolt block for sure because of the girdle caps being seperate. Just curious if this is going to do damage being a smaller oil filter..

Oy.. Ok turns out the one i took off leaves alot of the sending unit exposed. It goes on just fine and covers it but I'm still very iffy about it even if theres technically no "opening" for oil to spill out...

 

[19Eclipse90]

All in all you should probably get a 6 bolt. They are less likely to crank walk. If you get a 7 bolt from a 2g, you will see the rods are not as beefy. The 7 bolt motors also used 11mm head bolts instead of 12mm.

Regards
Greg

All 7-bolts had the same rods.

The head bolts are EXACTLY the same millimeter.

Not sure what you are saying here, but 6-bolt and 7-bolt head bolts are different -- not only in diameter, but in length as well.

Since we're talking about differences here, I went to buy an oil filter, and was handed a huge round one, last change i had done has the skinny one that the parts store had listed under the 93-94 4g63's...and the 90-92's have one that looks similar to the 2gnt's except not as tall... a little lost, is it possible I have a 7bolt oil sending unit on my 6 bolt block? I know it's a 6 bolt block for sure because of the girdle caps being seperate. Just curious if this is going to do damage being a smaller oil filter..

It's possible to have a 7-bolt oil filter housing (as you cal lit, "oil sending unit"), but it isn't easy and it isn't something you'll see done very often, at all. It requires heavy modification on the 6-bolt block and a 7-bolt front casing/oil pump, as seen here: 6 Bolt Motor Install Into a 2G Eclipse. The likelihood you have a 7-bolt oil filter housing and oil pump on a 6-bolt block is slim to none.

Really not a huge issue, in my opinion, but 6-bolt blocks use short, fat filters so if that is what you have, that is correct.

 

[Viva]

Okay so i have this guy trying to sell me a 93 talon tsi awd. problem is he cant give me a straight answer if its a 6 bolt or a 7 bolt. if i were to look at the car all put together how can i tell the difference from looking at the motor. people tell me the pump and pan are different. but which is which????????????

 

[phunny]

Here ya go brother

http://www.dsmtuners.com/forums/new...-7bolt-6-bolt-7-bolt-six-bolt-seven-bolt.html

 

[19Eclipse90]

Instead of having to weed through the nonsense in that thread, simply take a look at the oil pan on the timing side: How to quickly tell a 6bolt and 7bolt engine apart

You must be logged in to view this image or video.

 

[94talontd]

I thought the 1g 7-bolt engine had 12mm head studs like the 6-bolt?

 

[19Eclipse90]

Via Mitsubishi ASA for DSMs with the 4G63:

1988.05.1-1992.04.3.....Cylinder Head Bolt.....MD121887.....M12 x 1.25mm pitch x 84mm long.....6-bolt
1992.05.1-1999.04.3.....Cylinder Head Bolt.....MD191470.....M11 x 1.25mm pitch x 97mm long.....7-bolt

 

[Viva]

its a legit 6 bolt and 4 bolt rear. it was imported aswell.