3.0 rsr
 

Hi,I am sorry for the confusion.There were no 2.7 twinplug RS engines.Building a 2.7 RS to a 2.8 Twinplug was a popular build with the mechanical injection.An engine serial number would clarify this question.Fred

Thanks Fred for the feedback. Unfortunately I won't be able to get a number or photos for the time being. This will take some time I'm afraid. You could be right perhaps that it is a built RS motor. Until I get close enough we won't know for sure. Truth be said, I am going the indirect method i.e. taking my time and not rushing the buy proposal, We'll find out the factual details when the time comes, if it comes. Keeping the fingers crossed for now.
Bernard

Bernie,

An RS engine would have a type number of 911/83. An RSR would have been a 911/72, 911/73 or 911/74. That's the first thing I'd check.

An RSR motor would have some external differences to an RS. I would look for these things:

A cast magnesium housing for the racing oil filter assembly where the engine-mounted oil cooler would have been on an RS.

Sand cast magnesium chain covers with a provision for central oiling for the camshafts.

Different injection stacks, with either a higher position for the throttle butterflies or slides instead of butterflies.

A different injection pump. Google a picture of an RSR pump to see the differences.

If you see an aluminum crankcase, instead of a magnesium one, get a casting number off of it.

Detailed photos would always help, when/if you can get them.

If it's an RS engine that has been twin-plugged, that would imply that it's internally modified, as there's no reason to do that to a stock RS engine with its low compression ratio. If it's been built as a 2.8, most likely they will not have used the correct RSR cylinder heads, so it's a bit of a bastard engine. All of this affects the value of an RS engine, if it turns out to be one of those.

JR

Wow JR! What a trove of pertinant info that I was desperate for. How long did it take you to dig that up? I don't know how I can repay you for this, if I can I will. As said, this may take time, or not. It may come to nothing , or not.

I will need time to purchase this motor if possible. It is possible I believe, or I woudn't be going on about it. I sure appreciate all the member's feedback on this one. If I get any new info, I will post it

Bernard

Did you get my pm the other day?

Hi Matt,

I didid't sorry. Truthfully, I never check PM because no one ever sends any. I think your message was no. 17 and this goes back to 2007 maybe? I did take a 4 year vacation from the forum after first joining. Not to labor it. I got it Matt. I will get back to you shortly.

Best,
Bernard

Most Porsche specialists would apply the same rule.

Fully rebuilt genuine 1973 2.7 RS engine (a genuine 663 stamping, there are plenty of fakes around) sold end of last year for £150,000 ($183,000). Chassis was badly damaged scrapped in the 80's. It had just had a £25,000 engine rebuild.

That's around 1/3 of a nice RS touring.

Thank you Manipou,

Great information! I'm going to take that 1/3 ratio to heart, but that means I have to be a lot more cashed up to get it too right? We'll see. It will take much more time before I can even take a swing at it, due to various constraints time and otherwise. I will do my best, but it won't happen overnight. Wish me luck as Matt Monson did. I think I will need it.

Best,
Bernard