9A1 goes racing-Finally!!
#61
Race Car
Join Date: Jan 2013
Location: The way to hell is paved by good intentions “Wenn ich Purist höre...entsichere ich meinen Browning” "Myths are fuel for marketing (and nowadays for flippers too,,,)" time to time is not sufficient to be a saint, you must be also an Hero
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#62
9A1 internals in GT3 R?
I will post this question here as it seems relevant to the 3D ...
I am not familiar with the homologation procedures of the GTD series and I was wondering (besides the marketing content of the official press releases by PAG): how much of the internal components of the GT3 R 9A1 engine are really in common with the 9A1 engine in the road-going RS?
Here on the European forums the consensus is that almost zero components are in common besides the bore-stroke measures ... Probably not even the crankcase.
This would bring support to the argument that the 997 GTs are the last ones with a racing based engine.
Difficult to find somebody in the knowledge without some skin in the game, either wanting to inflate the 997 GT prices or the 991 GT prices ...
But I was wondering ... at least the crankcase should be a production component in the GTD class, otherwise they are a prototype as much as a GTLM class RSR ...
Maybe someone on RL can shed some light.
Myself, I own only old AC mezger powered 911s ... so I do not care which GT3 goes up in price because of the alleged "racing connection".
I admit having an RS incoming on week 10, but planning to use it and drive it for substantial km: I suppose the racing results and connection will not make any difference by the time I may sell it a few years down the line: no garage queens for me, thanks.
Looking forward to hear some experts.
I am not familiar with the homologation procedures of the GTD series and I was wondering (besides the marketing content of the official press releases by PAG): how much of the internal components of the GT3 R 9A1 engine are really in common with the 9A1 engine in the road-going RS?
Here on the European forums the consensus is that almost zero components are in common besides the bore-stroke measures ... Probably not even the crankcase.
This would bring support to the argument that the 997 GTs are the last ones with a racing based engine.
Difficult to find somebody in the knowledge without some skin in the game, either wanting to inflate the 997 GT prices or the 991 GT prices ...
But I was wondering ... at least the crankcase should be a production component in the GTD class, otherwise they are a prototype as much as a GTLM class RSR ...
Maybe someone on RL can shed some light.
Myself, I own only old AC mezger powered 911s ... so I do not care which GT3 goes up in price because of the alleged "racing connection".
I admit having an RS incoming on week 10, but planning to use it and drive it for substantial km: I suppose the racing results and connection will not make any difference by the time I may sell it a few years down the line: no garage queens for me, thanks.
Looking forward to hear some experts.
#63
Even the 996/997 cases are not the GT1 cases- they are 'based' on them, so very few parts are likely to have any racing heritage from that car- they have heritage in the cups and other classes where 996 and 997's have raced.
Same for every car- hell they have raced BL Austin Maxis, Morris Marina's, Ford Zephers and Anglias etc- I seriously doubt there is a car that has no racing heritage since they first built cars! Simply there is no need to bleet on about it.
Same for every car- hell they have raced BL Austin Maxis, Morris Marina's, Ford Zephers and Anglias etc- I seriously doubt there is a car that has no racing heritage since they first built cars! Simply there is no need to bleet on about it.
#64
Technical Guru
Rennlist Member
Rennlist Member
#65
Thanks for your inputs.
I understand that the 991 RSR is a full prototype and the official bore-stroke number are different from the 9A1 in the roadgoing RS.
I was more interested to hear about the 991 GT3 R running in the GTD class, for which the bore-stroke official number are nominally the same of the 4.0 lt 9A1 in the roadgoing 991 RS.
Homologation info (or a summary) on the GTD rules would be helpful.
I understand that the 991 RSR is a full prototype and the official bore-stroke number are different from the 9A1 in the roadgoing RS.
I was more interested to hear about the 991 GT3 R running in the GTD class, for which the bore-stroke official number are nominally the same of the 4.0 lt 9A1 in the roadgoing 991 RS.
Homologation info (or a summary) on the GTD rules would be helpful.
#66
GTD regulation
With a little research I found a GTD Technical Regulation (not sure if updated and current to 2016).
In point 6.2.1 it states:
Cylinder block, cylinder head(s), valve angles, number, material and location of camshafts: must remain original, as they are fitted on the production vehicle. The firing order is free.
I am not sure if it really means that a GTD car has the same crankcase and heads from the road-going model, but it sounds like it.
In point 6.2.1 it states:
Cylinder block, cylinder head(s), valve angles, number, material and location of camshafts: must remain original, as they are fitted on the production vehicle. The firing order is free.
I am not sure if it really means that a GTD car has the same crankcase and heads from the road-going model, but it sounds like it.
#67
With a little research I found a GTD Technical Regulation (not sure if updated and current to 2016). In point 6.2.1 it states: Cylinder block, cylinder head(s), valve angles, number, material and location of camshafts: must remain original, as they are fitted on the production vehicle. The firing order is free. I am not sure if it really means that a GTD car has the same crankcase and heads from the road-going model, but it sounds like it.
But yeah, it does look like same as production as I can see from the working as well. It could mean in Porsches case that it is a possibility that it's based off a GT3 RS rather than a bored out Boxter 2.7L if you know what I mean.
#68
Technical Guru
Rennlist Member
Rennlist Member
With a little research I found a GTD Technical Regulation (not sure if updated and current to 2016).
In point 6.2.1 it states:
Cylinder block, cylinder head(s), valve angles, number, material and location of camshafts: must remain original, as they are fitted on the production vehicle. The firing order is free.
I am not sure if it really means that a GTD car has the same crankcase and heads from the road-going model, but it sounds like it.
In point 6.2.1 it states:
Cylinder block, cylinder head(s), valve angles, number, material and location of camshafts: must remain original, as they are fitted on the production vehicle. The firing order is free.
I am not sure if it really means that a GTD car has the same crankcase and heads from the road-going model, but it sounds like it.