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M5guy's Avatar
 
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Engine mounted too far back?

I overheard a conversation at Hershey in which a Porsche mechanic told a 930 owner that his engine was mounted a little too far back in the car.

How is that possible?

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SR
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Old 05-01-2013, 04:27 PM
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It's not possible, but done by design I think. Maybe further back than a 911, but damned if I know for sure. There is no way you can ***** up an engine install and just accidentally push it too far to the rear...at least not that I'm aware of.
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Old 05-01-2013, 06:12 PM
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Yeah that's what I was thinking. Since the mounting bolts for the gearbox and engine bar are vertical, there just isn't any fore and aft slack.
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SR
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Old 05-01-2013, 06:31 PM
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930 engines from '78-'88 are mounted about 1" farther back than 911 engines 74-86. The reason is the 915 tranny in the 911 is 1" shorter in the bellhousing area than the 930 4spd.
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Old 05-01-2013, 07:53 PM
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When they started putting the thick rubber center clutch disc in 930's (that was a mistake) they had to make the bellhousing deeper to make room for it.
Old 05-01-2013, 08:25 PM
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Quote:
Originally Posted by RarlyL8 View Post
930 engines from '78-'88 are mounted about 1" farther back than 911 engines 74-86. The reason is the 915 tranny in the 911 is 1" shorter in the bellhousing area than the 930 4spd.
Are you sure about that?
All models use the same engine carrier and support beam (called "motor console" and "bracket" in PET). Therefore, the back end of the engine must always be in the same place.
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Old 05-01-2013, 09:00 PM
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Quote:
Originally Posted by billjam View Post
Are you sure about that?
All models use the same engine carrier and support beam (called "motor console" and "bracket" in PET). Therefore, the back end of the engine must always be in the same place.
NO!!!

They are different:

930:



911:

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Old 05-01-2013, 10:42 PM
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I know the gearbox mounts are different. That's where the extra length is taken up.
I'm pretty sure the fan end of the engine is always in the same place.
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Old 05-02-2013, 12:54 AM
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Sorry missunderstood your post, you are talking only about rear end... yes, fan is always in same position
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Old 05-02-2013, 02:00 AM
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mine is an 88 and there are two sets of holes for the transmission crossmember in the body mount. The rear two holes are where it goes. I'm assuming the forward set of holes is for the g-50' that went in the NA cars. Only one mountis location in the back though.
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Old 05-02-2013, 04:23 AM
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Quote:
Originally Posted by M5guy View Post
I overheard a conversation at Hershey in which a Porsche mechanic told a 930 owner that his engine was mounted a little too far back in the car.

How is that possible?
Maybe you misunerstood, and the mechanic actually told the 930 owner, "that thing's got back" (Sir Mix-a-Lot style).
Old 05-02-2013, 06:24 AM
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Quote:
Originally Posted by RarlyL8 View Post
930 engines from '78-'88 are mounted about 1" farther back than 911 engines 74-86. The reason is the 915 tranny in the 911 is 1" shorter in the bellhousing area than the 930 4spd.
Some funny remarks but Rarly8, JFAirman and the mechanic are right. In 1978 the 930 motor was moved to the rear 30MM by lengthening the bellhousing which made the car more tail heavy than the 77 and prior 930. He was tongue in cheek referring to the fact it was a newer than a 1977 930. To use a 78 or newer 930 transaxle in a 77 or prior 930 or in a 911built prior to sometime in the mid 80s you must shorten the bellhousing and mainshaft by 30MM, or find a original 75-77 short bellhousing and mainshaft ( good luck ) although I just found one although a few years too late. One reason the short bellhousing transaxles are expensive and in short supply. A few years ago I went thru this with a 1979 911 SC ( same engine location in chassis as 75-77 930 ) in which we used a 88 930 motor and 930 4 spd. Had to get the mainshaft and bellhousing machined 30mm shorter to get it bolted in the original location. So yes the 78 and later 930 Motors are mounted 30mm further to the rear of the car.
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Old 05-02-2013, 05:23 PM
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Engine position.

The rear crossmember directly to the rear of the engine on a 78up 930 is different. It allows the triangular chassis pieces which hold the engine mounts to be mounted further back in the chassis.

Paul

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Old 05-02-2013, 08:17 PM
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