Hill climb engine modifications for Road Cars

Hill climb engine modifications for Road Cars

Author
Discussion

Eyebrows123

Original Poster:

6 posts

39 months

Sunday 18th October
quotequote all
Currently looking at setting up a car in the road going class to do hill climbs with.

Car in question is a Volvo 66. Ideally I really want to change the cylinder head of the engine to an improved one (Renault Gordini), it was a standard modification at the time, the modification is homologated however, the rules state:

"the cylinder block and cylinder head must remain in the original position and be externally identifiable as that fitted to the original model or specified option."

The engine in these cars is a renault engine, but the standard head doesn't flow as well as the one from the renault, i don't think it was available from the factory on the Volvo. There are several instances of it which are homologated though, i don't know but I could look and I wouldn't be surprised if there was an instance of one of the factory works cars having the head. Would any of these make it possible to install it and still be ok in the Road Cars class?

I'm just trying to avoid being forced into the Modified class as that's opening a large can of worms and I can quickly see budget going out of the window!

HustleRussell

18,466 posts

118 months

Sunday 18th October
quotequote all
It’s not going to be legal in class- the regs are quite explicit. An unmodified class is just that. This is why halo models and homologation specials enjoy such a premium.

Truckosaurus

7,760 posts

242 months

Monday 19th October
quotequote all
That seems a fairly minor mod, you see plenty of Minis running things like weber carbs that were never factory options (no idea if they were ever homologated).

In reality no-one would notice and you'd only have an issue if someone complained.

df76

2,541 posts

236 months

Monday 19th October
quotequote all
I'm fairly certain that no one would actually have a problem with it being used on a Volvo 66. I'm assuming that you can't modify the existing head to suit (you can actually make big changes in the Road Car class)??

Perhaps get a bit more detail about the homologation as well, that may tell a story. And might have been considered as an "option".

Eyebrows123

Original Poster:

6 posts

39 months

Monday 19th October
quotequote all
So, the head in question came from a renault gordini engine. The benefit of it is it is crossflow (so already its quite obvious that the carb and exhaust are suddenly on opposite sides!). The engine itself is a renault cleon fonte engine, these were fitted as standard to the DAF/VOLVO. It's just they only had the standard heads but the better head to fit is the head from a renault gordini (same engine, just performance tuned so a better flowing head). I don't think DAF/VOLVO offered them as a factory option.

What would you need as proof? I expect a sales brochure detailing available options?

If you look at the available homologattion papers on the fia website of homologated cars, almost all the DAF 66 and Volvo 66 have detailed the modification of the cylinder head change. But I'm guessing this gets me nowhere?

carl_w

6,476 posts

216 months

Tuesday 20th October
quotequote all
Eyebrows123 said:
Currently looking at setting up a car in the road going class to do hill climbs with.

Car in question is a Volvo 66. Ideally I really want to change the cylinder head of the engine to an improved one (Renault Gordini), it was a standard modification at the time, the modification is homologated however, the rules state:

"the cylinder block and cylinder head must remain in the original position and be externally identifiable as that fitted to the original model or specified option."
I can imagine that if you have a Volvo and when you open the bonnet it says "Renault" on the cylinder head that it would b e difficult to claim it was externally identifiable as that fitted to the original model or specified option.

df76

2,541 posts

236 months

Tuesday 20th October
quotequote all
Eyebrows123 said:
I don't think DAF/VOLVO offered them as a factory option.

What would you need as proof? I expect a sales brochure detailing available options?

If you look at the available homologattion papers on the fia website of homologated cars, almost all the DAF 66 and Volvo 66 have detailed the modification of the cylinder head change. But I'm guessing this gets me nowhere?
That's an accurate summary I think. You need to demonstrate that it was an option.

stevieturbo

14,997 posts

205 months

Tuesday 20th October
quotequote all
I'd imagine most people looking at it...wouldn't have a clue it was not the original anyway.