Go-carter

Hi there!

Recent problems with my engine is now tracked down to either piston rings, or vale guide seals, or even worse(probably). Exhaust full of oil, blue smoke on idle and accelration, and lots of oil in the air-filter box.

So... What would you suggest doing here? A complete rebuild would be nice, but on the other hand swapping in a 4,7(and perhaps an S/C?) with a bit more hp could also be fun

Currently I have CIS, and that means that putting in a never(non CIS) engine is realtively complex? Is it done before? Tried searching, but didn't come up with much...

Thanks for opinions and suggestions...

GlenL

Ya gotta evaluate your own time availability, abilities and budget.

With no real information, I will suggest that you get a 4.7l S engine with CIS (Pre-'84) and put it in. It will be drop-in, plug-compatible with your current CIS system. Maybe some fuel line changes but it'll be fine. Going with a later engine will require electrical work including sourcing the computer.

If you go that route, don't worry about other mods. At least not until it's done. Going from 220hp to 300hp will be a substantial improvement. You'll be enjoying your car like you couldn't imagine.

IcemanG17

The cost to properly rebuild any 16V 928 engine is about the same.....and starts at about $1500 just in parts.....then add machining if its needed....and labor.... Assuming minimal machining your best case scenario is about $4k

By far the best option is get a used engine....928intl sells them for $1500 & even less for shortblocks...

Glen is right about the 4.7L....extra 200cc with higher compression so its a bit more performance....could be MUCH more with just Euro cams.....I would get a 4.7 & a set of euro cams from 928intl.....thats about $2500.....do a TB/WP, main seals, oil pump seals, cam tower seals + end caps and your pretty much done.....should be around 240+whp too

Go-carter

Well, I'm in Europe so everything here should be "Euro"

Was talking to my local "parts vendor"(chopping and selling 928's) And he said IF I was patient, he could probably get hold of a 4,7 for me but they are getting pretty rare over here. Btw, my 4,5 euro should have 240hp, or?

$1500 for a rebuild.. OK, thank sfor the number! Isn't so easy to calculate every part, when your'e surfin pelican

Vilhuer

4.5L engine piston rings are much more expensive than 4.7L. So much more that its cheaper to get complete used ok condition 4.7L bottom end than just rings for all 8 cylinders. Or at least it was when I last checked.

Go-carter

Do you know of anyone in Finland, or Sweden? Or perhaps part vendors? Pretty new in the 928 game, so I only know of one in Sweden.

Vilhuer

There is '85 ROW 16V complete engine available at one local vendor. He might have some other engine parts also.

http://www.pvr-service.fi

Go-carter

Would it be much trouble to install a motor with computer? I've dealt a LOT with wire-harnesses in my racecar(got a Honda Blackbird motor in it), so I'm quite familiar with electrics. However, if it involves messing with too much, I might as well wait for a CIS engine to come up(Eventhough I'm completely sick of that system, now having it in two of my cars )

I've found a M-28/22 engine for sale in Sweden. No compression on cylinder 1(and obviosly needs a LH-brain) but cheap. TBF perhaps?

mark kibort

you can put any 4.7L bottom end under your current heads and intake. you can even get a 5 liter US 85,, an only take the pistons out and notch them for the 2 valve heads and for $500 of machine work, get a 5 liter vs 4.5 liter you have now. easiest way , is to just take any 4.7 and stick it in there. however, you might want to slap on some euro heads and cams. and while your in there, slap on a euro S intake, (80 to '83) but you can always do that later. that way, everything is plug and play , no mods.

V-Fib

Putting the 4.7L in the 79 was the best upgrade I could have done. A very easy swap compared to a non CIS swap.

It may be advantageous to completely inspect your 4.5L before deciding on a 4.7L swap. It probably would be less expensive in the long run to just rebuild your engine. I rebuilt the 4.7L after I bought it. No sense in putting an unknown engine back in.

If you do the 4.7L swap, put headers on it....before you put the engine back in.

mark kibort

you cant get the engine headers on the engine first and then drop it in. doesnt work! shorty headers, like 85s, maybe.

before I rebuilt a 4.5, i would probably buy a used 4.7 short block and rebuild it. better oiling and parts are cheaper.

V-Fib

A rebuild either way, and a 4.7 would be better so I concur....

and the headers, I should have been more specific, put them on before bolting the engine in.

Go-carter

Hi! Thanks for input(I love your race-928 btw ). So.. I could buy a TBF engine cheap(for example), rebuild my old heads, and put them on the new engine? Nice.

The only thing I'm worried about is installing a LH-brain. I swapped my old landie' engine with a 2,8i V6 from a Granada, and that was a pain in the a$$ getting the ignition brain for it to work. Do you guys think it would be possible? Or do I miss some massive components from a -83/-85 wiring loom, that is nessecary to make it run? Checked the wire diagram for a -84 yesterday, and didn't see anything special with the LH brain. If it's not -that- much more complicated, I might as well just buy a 5.0 and slap it in

Btw. No matter what engine I'll end up with, it's going to be rebuilt (atleast change piston rings and valve seals!) Before I put it in.

Thanks!

EDIT: HEY WAIT A SEC! Now I see what youre meaning! I can use the CIS-system I have now(+ old heads), and just smash it on top of a 5.0 engine?

GlenL

You could do that: your current CIS system, 5l block, 4.7l heads. Using the 4.5 heads wouldn't get all the power. The 4.7 "S" heads have bigger passages and bigger valves. Then the cams on the "S" are better, too.

The 4.7l "S" will bolt right up. Better exhaust manifolds is a good addition.

Then again, if you want a more involved project...

Go-carter

Okey, I'm considering the 4,7(M-28/22) now. I think the 5.0 is project that I don't have time to now. I can get it for $600, and then I just need a LH brain and new valves for the #1 cylinder. + rebuild. Good plan? 4,7 CIS is hard to get over here right now.