Engine Swap GRANTURISMO 4,7

J

Jgs

New Member
Messages
6
Hi,

I have a 2012 granturismo 4,7 s with a pretty substantial engine problem, so it's probably cheaper to find a replacement engine for it.

Question is, which engines are plug and play in terms of hooking up to the cars existing ecu? Would a newer
Mc stradale engine be a straight fit?
 
J

Jgs

New Member
Messages
6
Valve and piston is kissing due to big end cap has come loose for some reason, car is at Maranellos now, and repair will be too expensive I’m afraid. 29.000 miles, great quality...
 
Ewan

Ewan

Member
Messages
6,833
Your car will be worth most if kept to original spec, so be wary of "upgrading". Replace it for like-for-like.
 
highlander

highlander

Member
Messages
5,225
Jeez, 29k miles and engine stuffed! That is harsh even by Italian standards, feel for you mate, hope you get it sorted.
 
alfatwo

alfatwo

Member
Messages
5,517
Just stick to the standard spec when you eventually buy a second hand engine or the car will be worthless..

Or just set fire to it and claim off the insurance!

Dave
 
E

Eddie

Sponsor
Messages
17
So you'll need a decent used/ new crank, gaskets, a few valves, some shells, cap bolts and a bit of labour. What were you quoted, and what was the reason they diagnosed as the failure cause? Bear in mind non-matching numbers caused by used engine swaps will be detrimental to resale....
 
marios kriticos

marios kriticos

SPONSOR: Autosheild
Messages
256
I looked at an engine last week in Cyprus with exactly the same fault , and we thing the bearing failed due to a faulty crank case .
The cheap way out of this is to replace the engine with a good used one , do not fit a 4.7 as you will need to replace your ecu also and it always better to keep cars as original as possible .
If you need any help call me and I will do what ever I can .
Marios
 
conaero

conaero

Forum Owner
Messages
34,651
Contigo said:
But it is a 4.7 so he wants to put a 4.7 engine in it.
Click to expand...

Thats how I read it.

The only 4.7 differences I know of (there may be more) are:
1. Variator modification which a 2012 model will have had done
2. Strad engines have a low friction coating on internal parts
 
J

Jgs

New Member
Messages
6
Conaero said:
Thats how I read it.

The only 4.7 differences I know of (there may be more) are:
1. Variator modification which a 2012 model will have had done
2. Strad engines have a low friction coating on internal parts
Click to expand...


Yes, I have a 4,7 and want to re-lace it with another that just fits with minimum fuzz
 
J

Jgs

New Member
Messages
6
marios kriticos said:
I looked at an engine last week in Cyprus with exactly the same fault , and we thing the bearing failed due to a faulty crank case .
The cheap way out of this is to replace the engine with a good used one , do not fit a 4.7 as you will need to replace your ecu also and it always better to keep cars as original as possible .
If you need any help call me and I will do what ever I can .
Marios
Click to expand...

I have a 4,7 and want to replace it with another basically. As easy fit as possible with minimum fuzz. I would need someone to do the job for me, and I need the car back relatively quickly. Drop me a WhatsApp on 07939481353 or call
 
mjheathcote

mjheathcote

Centenary Club
Messages
9,046
Eddie said:
So you’ll need a decent used/ new crank, gaskets, a few valves, some shells, cap bolts and a bit of labour. What were you quoted, and what was the reason they diagnosed as the failure cause? Bear in mind non-matching numbers caused by used engine swaps will be detrimental to resale....
Click to expand...

I agree, although in reality, who checks the engine number before buying against the v5, or asks the dealer 'is it a matching numbers car'?
We should of course.
 
rockits

rockits

Member
Messages
9,180
Funny you should say that. When I bought my R129 SL60 AMG a few years back I did but nobody else had.

The SL60 I bought was purchased new by Lennox Lewis for his brother Dennis. The SL60 was a rare car that started as an SL500 on the Mercedes production line but then shipped out to AMG (they were separate then) without alloys bumpers but stock SL500 other than that with SL600 brakes.

AMG would charge Mercedes to then make the SL500 into the SL60 with new heads, camshafts & other bits & bobs. New AMG bumpers front/back & side mouldings with new 3 piece split rim alloys. Oh & of course bored out to a 6.0 V8!

When I bought the car I wanted to check it was a known and genuine SL60. There were many triers & imposters & fake SL60's as records at AMG back then we're sketchy at best. All the AMG parts were stamped with a prefix HWA part code which helped distinguish a genuine car. Also the engine number would be changed I understood. My car had the engine number changed day one but it was not changed from day one with DVLA. All 4 of the previous owners either never checked or were never bothered. I checked and the engine number was different on the V5 to the car as it hadn't been registered correctly day one.

Just shows you how it can happen. I finally got Mercedes CAC (yes that is their Customer Assitance Centre acronym!) to locate some old records from AMG Japan to confirm they believe my car was a genuine SL60 & the AMG works were completed at AMG Japan & not like many at Affalterbach. The different between a 5.0 SL500 at circa 300bhp & SL60 at circa 410bhp was fairly marked but it was good to be sure. A rolling road session later backed it all up as well.

Then I sell the buggering thing a few years ago like an idiot!

Back to what Mike was saying before I went off piste. I am sure tons of people never check the engine number on the car to the V5!
 
O37

O37

Member
Messages
101
Conaero said:
Thats how I read it.

The only 4.7 differences I know of (there may be more) are:
1. Variator modification which a 2012 model will have had done
2. Strad engines have a low friction coating on internal parts
Click to expand...

With regards the friction coating, not just the Strad, couple of other interesting insights taken from -

https://www.netcarshow.com/maserati/2012-grancabrio_sport/



"The Maserati GranCabrio Sport uses the latest version of Maserati's sonorous, all-alloy 4.7-litre V8, taken straight from the high-performance GranTurismo MC Stradale.

This naturally aspirated engine produces 450 horsepower (331kW) at 7000rpm: that is10hp more than the GranCabrio. It is also rich with torque, with a peak of 510Nm (20Nm more than the GranCabrio) arriving at 4750rpm. Eighty percent of its maximum torque is already available at just 2500rpm.

The performance increases are a result of Maserati's Friction Reduction Program, which has made the Maserati GranCabrio Sport's engine more reactive to the driver's most-nuanced inputs. This program included a revision of the oil sump's fluid dynamics and the application of a Diamond-Like Coating to the tappets and the super-finished camshaft lobes.

Besides added power, torque and responsiveness, the Friction Reduction Program has lowered the Maserati GranCabrio Sport's fuel consumption by six percent to a combined total of 14.5 litres/100km."
 
R

Rob Eaglestone

New Member
Messages
3
HI
This is my first post :)
I don't think a crank shaft end cap would cause valve kiss .
The crank shaft is held in place by several bearings along its length.
A big end, end cap might ... if the big end end cap came loose then the upper shell bearing could dislodge and the piston could move closer to the valves .
I would get a 2nd opinion .
It sounds fixable . You might need new big end bearings and possibly 2 valves . Valve followers ?! Cant be more than the price of a new engine ?!
 
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