Adding a 915 trans to a 6 conversion, There must be a better way Options

[mepstein]

Is there any reason I shouldn't consider working up a cable shifter instead of the traditional 916 shift linkage. The current 916 kit is $3-3250. Add in labor for machining and assembly and you're at $5k just to make the trans shift correctly. The suby guys are doing the shifting with $300 worth of cables and hardware. Am I missing something here?

[rgalla9146]

Is there any reason I shouldn't consider working up a cable shifter instead of the traditional 916 shift linkage. The current 916 kit is $3-3250. Add in labor for machining and assembly and you're at $5k just to make the trans shift correctly. The suby guys are doing the shifting with $300 worth of cables and hardware. Am I missing something here?

I wonder if Martin Bott would sell his side shift parts separate from his complete 916
conversion kit ?
The trans can be supported with a fabricated rear mount (which someone already makes)and the 915 rear cover and selector shaft can be trimmed to clear the muffler.(or not ?)
If so, the only fabrication is the shift rod which is pretty straight forward and getting it to coordinate with a 915 shifter. Oh yeah, clutch cable too.
PS I have the whole setup from Mr. Bott and already did the trans conversion but haven't gotten far enough with the car to actually drive it.
There are certainly other ways to skin a cat.
How about a Boxster trans ?

[larryM]

check this - apparently Martin's parts ???

https://sfbay.craigslist.org/pen/pts/6146003135.html

Porsche 915 to 916 Side Shifter Conversion Tooling and Parts.
Description:
1 Set Detail Machining Drawings
1 Set San Casting Patterns
2 914-6 Firewall Engine Mount
3 Rear Castings
1 Machined Rear Casting.
3 Machined Side Shift Housing (One Is Assembled)
3 Internal Shift Arms ( 2 with Shafts)
Total Price $5,500.00.

who among us is the seller?

p,s, - i have the complete Bott kit & a rebuilt 915 on the shelf - but have never had the compulsion to do the conversion since i have 3 good 901's & they'll handle 250hp which is all my 3.2 makes

I wonder if Martin Bott would sell his side shift parts separate from his complete 916
conversion kit ?
The trans can be supported with a fabricated rear mount (which someone already makes)and the 915 rear cover and selector shaft can be trimmed to clear the muffler.(or not ?)
If so, the only fabrication is the shift rod which is pretty straight forward and getting it to coordinate with a 915 shifter. Oh yeah, clutch cable too.
PS I have the whole setup from Mr. Bott and already did the trans conversion

[porschetub]

check this - apparently Martin's parts ???

https://sfbay.craigslist.org/pen/pts/6146003135.html

Porsche 915 to 916 Side Shifter Conversion Tooling and Parts.
Description:
1 Set Detail Machining Drawings
1 Set San Casting Patterns
2 914-6 Firewall Engine Mount
3 Rear Castings
1 Machined Rear Casting.
3 Machined Side Shift Housing (One Is Assembled)
3 Internal Shift Arms ( 2 with Shafts)
Total Price $5,500.00.

who among us is the seller?

p,s, - i have the complete Bott kit & a rebuilt 915 on the shelf - but have never had the compulsion to do the conversion since i have 3 good 901's & they'll handle 250hp which is all my 3.2 makes

I wonder if Martin Bott would sell his side shift parts separate from his complete 916
conversion kit ?
The trans can be supported with a fabricated rear mount (which someone already makes)and the 915 rear cover and selector shaft can be trimmed to clear the muffler.(or not ?)
If so, the only fabrication is the shift rod which is pretty straight forward and getting it to coordinate with a 915 shifter. Oh yeah, clutch cable too.
PS I have the whole setup from Mr. Bott and already did the trans conversion

Good points really is the 901 that bad,even if you exceed 250hp it is cheap enough to replace or adjust your driving style.
The 915 isn't the total answer in fact the real 911 guys grizzle about them,they aren't as strong as expected and a very noisey....not such an issue in a 914 but in a 911 not so good.

[larryM]

p,s, - i have 3 good 901's & they'll handle 250hp which is all my 3.2 makes

.... really is the 901 that bad,even if you exceed 250hp it is cheap enough to replace or adjust your driving style.

The 915 isn't the total answer in fact the real 911 guys grizzle about them,they aren't as strong as expected and a very noisey....not such an issue in a 914 but in a 911 not so good.

- i gently use 1st to get up steep drives & such - but that's about all it is good for even behind a 1.7

i have an acquaintance who ran a chevy 350 in an scca 914 - never broke it - he is a former PCNA employee - it was his advise that convinced me me stay with the 901

as discussed elsewhere on this site - the main problem with a 901 is if you rev to 6000 & drop the clutch in 1st gear - it will twist off the mainshaft - when we AX, we all just start in 2nd gear - and stay there - kinda like having an automatic! - a good-stronger-durable clutch helps

for we on a budget - the 901 is an OK conversion solution vs $10K for a 915-916

904 mainshafts can solve that - but they are/were rare as hen's teeth - one FS on ebay now - $1200 - there was someone making repros back in 2008 -
repro here for $1415 - https://retro-sport.com/porsche-gears/porsc...haft-new-albins

901s are also subject to wear in the intermediate plate (i broke 2 due to that when racing) - there is a fix for that - originally developed by Dwight Mitchell for 911's https://www.google.com/search?q=901+interme...-8&oe=utf-8

both above mean a rebuild, of course - but still arguably cheaper than a 915 rebuilt PLUS Bott kit

- 915's are subject to similar wear issues in the side plates & i know of 2 guys who got cheap 915's for a 914-conversion & wound having to rebuild 'em beyond the ring-gear flip (no longer cheap)

so it's kinda a tossup depending on how rich you are feeling, or actually are

- if we are talking about converting a 4 to a 6, the economics are not there - imho -4 conversion cars are never worth enuf to justify the added cost

p.s.- interesting about those C-list parts - i kinda wondered if it was somebody's attempt to steal someone else s work given the included drawings