manifold clearance

[osgood]

Originally Posted by steamyrotter

managed to get mine to go over the rear axle.

there are 4 flexi sections there (yes sorry 4) which give enough when it hits. hence reaonable ground clearance and a not too bad sound. mind you that will change when you get the wind going as well.

Mind you two of us have been bouncing on the rear and they don't appear to touch much.....yet.......


And Kev....

Don't think i'll subject anyone to the NCRC down ere.....

Steamy is your car jag based cant remember Osgood??

[kevchard]

Hi Eric
Deans, mine, ceejays and lazyboys are all cortina based.
Our sump is the lowest part, so am hoping not to ground that out.
What size tyres can you fit on 15" rims on a corty based viper? 65 profile would be good for sva and ground clearance, but not sure if they are too big for arches. Also how wide do you think i can get away with safely for SVA? I dont want to buy tyres twice if i spec wrongly in the first place.

[osgood]

Originally Posted by kevchard

Hi Eric
Deans, mine, ceejays and lazyboys are all cortina based.
Our sump is the lowest part, so am hoping not to ground that out.
What size tyres can you fit on 15" rims on a corty based viper? 65 profile would be good for sva and ground clearance, but not sure if they are too big for arches. Also how wide do you think i can get away with safely for SVA? I don't want to buy tyres twice if i spec wrongly in the first place.

Hi Kev, ahh right Cortina based, just inquired as we tried desperately to get over the axle on my car (Jag) but no can do. Think my sump is around 4-5" off the deck and never had a problem in that area. 15" as you know are a bit of a problem these days not so much finding them but getting the right speed rating to match your figures at SVA.

My car has 8:5J front & 10:5J rear at present, I have 235x50x15 and 245x50x15 at the rear. I could go a lot bigger than that on the same rims if required but not a lot of point. I think I would stick to a 50 or 60 profile preferably 50 and if you have not got you wheels yet Kevin go for 16" which is more attractive re availability for tyres. I personally think that 17+ on a Viper would induce some wheel arch rubbing as you know most bodies on Viper do not sit square on Having said that Peter Ramella is 16" but Iain Jones has gone for 17" I think so we will have to see how hew gets on, not sure what Howard is running 16 or 17" I suspect. You will be suprised how much the suspension at the rear sits down with a fat git like me on board and the slim wife, full tank of gas (17:5 gallons) and luggage. Hope this helps mate regards Eric.

[viperjim]

Originally Posted by osgood

Jim as Howard says most Vipers have this problem some more than others, see the attached before and after. Osgood

thanks chaps , i really want underslungs and cutting the footwells is a bit drastic , as long as i know i can get the manifolds made thats ok cheers

[osgood]

Originally Posted by viperjim

thanks chaps , i really want underslungs and cutting the footwells is a bit drastic , as long as i know i can get the manifolds made thats ok cheers

Jimbo, it is better to do the cutting now I can assure you. You have the time right now where I did not; and under-slung from my experience re Viper is not the way to go, just my personal view of course Osgood

[cobra.mad]

Hi Guys

Not been very vocal lately but I thought I would add my comments,

Clearance between manifolds and chassis is tight 5 - 10 mm, I have made up some headers that just fit, they have to be on the engine before it’s fitted as there is no room to get them on in situ’ see photo, howeverI have not had to cut the chassis about.

I have gone for under slung exhausts and have managed to get a clearance of 120mm at the lowest point not really enough but I’ll see how it goes, they can always be changed later I guess.

As for wheels I have bought 8J 17” wheels, these where the widest rims I could get before they were outside the arches, I have kept the back space as the jag original , about 112mm backspace for brake clearance and to keep away from the inner wings. I am thinking of 235 40 17 fronts and 255 50 17 rears. I have found this link good for tyre info, there is a rim width calculator about half way down the page which was very useful.

http://www.carbibles.com/tyre_bible.html

I am currently trimming the interior and starting to think about SVA just for a brief update on my build.

Chris