manifold clearance

[osgood]

Originally Posted by Deck

Jim,
I got a set of stainless steel manifolds from the MGB club that are designed for the MGB GT V8. They're the tightest turn I could find and I did a fair bit of looking. still about 70mm from the face of the port to the back of the turn. I'm not sure what they're like performance wise and I still had to do a bit of "tweaking" on the footwells...
I Must warn you I haven't got the rest of the exhaust yet and while I've been thinking about unders, Osgood's just put the fear in me! I do think I can get these to turn if I need them to...

I also don't know how much the engine moves when under strain, therefore how much clearance is required. Can anyone let me know please?
Cheers
Dec

Deck, with a well balanced engine before I put the cut outs in I only had 1/4" between the header and the foot well wall did not seem to be a problem, apart from the fact if you wanted to remove the headers you needed a very long spanner on the back underside bolts and a treble jointed monkey some of the latter Vipers were paneled on the inner side of the frame so you gained an extra 1" +, but mine was not and the hinder things further I clad it in stainless. Had I not been rushing to complete it before the 2/3rds SVA test at the end of 1999 I would have made the mods require like Iain Jones has done. I can confirm under-slung on my car was a living nightmare, I tried about six different systems, 2 or 4 boxes, continually grounding out at the rear under the axle and the front boxes when fitted, the front down pipes were continually being dragged off the headers even with two clamps per side and some tacks of weld!!.

I also think the side pipes balance the Viper up better with the wide front arches and in my case with my rear Marmite arches

[osgood]

Originally Posted by kevchard

Hi Eric
Getting the car transported was a prob, V6 makes it uncommon and funds are still low cos we are battling to get original money back from never received manifolds.
After looking at how i have done it, i wondered why i did it that way. Hell no turning back now.
I've just sent off to summit to get dimensions on their side pipes. I need to know how far below the chassis the sidepipes will hang.
It's been a right pain trying to design cats into system.
You been banned lately Eric .
Hope you are all keeping well, and jokes are appreciated .

Morning Kev no all is well at the moment just a couple of posts wiped which I will get back to latter in the day with my reply to one of the Sherrifs F1 on today (practice) so I recon there will be a few blown lumps re this new 2:4 V8!!

Yes tranportation is expensive and inconvinient I must say, I was lucky that Mike had just recently made a set for Peter Ramella which were still in his work shop and prior to that had made a sysem for Iain Jones which as you probably know the 4 out pipes come under the chassis and dont exit through the body,couple of shots here of a Granada/Rover based Viper in Holland note the cuts outs once again regards Osgood

[steamyrotter]

Originally Posted by Deck

=
I also don't know how much the engine moves when under strain, therefore how much clearance is required. Can anyone let me know please?
Cheers
Dec

Depends on the engine mounts..

I have managed (stupidly) to mount mine whereby the thing doesn't appear to move more than 1/8" WRT the chassis in any direction.....
Even when hanging the whole lot off an engine crane.....
There is always one bolt you forget.... or in my case 3.........

I have gone for an underslung system of some design which appears to give me a reasonable clearance judging on the most probable routes i will be taking (in 209
If i can get it into the carpark at work it will go anywhere....

personal taste and gives a higher challenge when you change it at a later date.

expect the thing will shake my fillings out

Cheers

[hfbradley01]

Originally Posted by steamyrotter

Depends on the engine mounts..

I have managed (stupidly) to mount mine whereby the thing doesn't appear to move more than 1/8" WRT the chassis in any direction.....
Even when hanging the whole lot off an engine crane.....
There is always one bolt you forget.... or in my case 3.........

I have gone for an underslung system of some design which appears to give me a reasonable clearance judging on the most probable routes i will be taking (in 209
If i can get it into the carpark at work it will go anywhere....

personal taste and gives a higher challenge when you change it at a later date.

expect the thing will shake my fillings out

Cheers

Hi Dean

I've also fitted an unslung exhaust system, the thought of my grandchildren putting their hands on a side exhaust scared me.

Cheers

[kevchard]

Originally Posted by hfbradley01

Hi Dean

I've also fitted an unslung exhaust system, the thought of my grandchildren putting their hands on a side exhaust scared me.

Cheers

I know what you mean, it is a right git getting human flesh off the chrome

[hfbradley01]

Originally Posted by kevchard

I know what you mean, it is a right git getting human flesh off the chrome

I bet there aren't many cobra owners who are naturists who have side pipes....lol

[kevchard]

You could start a new faction of the CRC and call it the NCRC (naked cobra replica club).
Not sure about a lot of the 'members' physiques tho .

[osgood]

Howard could I just say, I went for under-slung for all those reasons, burning flesh, noise etc, but what surprised me when I made my own headers to match the 5" side pipes & shield after 4 years of total grief, made in Linc,s the packing is so good that I can bear my hands on them after 200 miles on a hot day!

Also being the deaf old git I am unfortunately I can hear the wife better with side than under-slung; thats bad news don't yer reckon I can tell you re the Viper and you are in an area of speed humps you will sadly regret it. Even on the motor way and I have 500 lbs worth of springs each side at the rear, in a steady dip with pipes below the axle they will still ground out best regards Osgood

[hfbradley01]

Originally Posted by osgood

Howard could I just say, I went for under-slung for all those reasons, burning flesh, noise etc, but what surprised me when I made my own headers to match the 5" side pipes & shield after 4 years of total grief, made in Linc,s the packing is so good that I can bear my hands on them after 200 miles on a hot day!

Also being the deaf old git I am unfortunately I can hear the wife better with side than under-slung; thats bad news don't yer reckon I can tell you re the Viper and you are in an area of speed humps you will sadly regret it. Even on the motor way and I have 500 lbs worth of springs each side at the rear, in a steady dip with pipes below the axle they will still ground out best regards Osgood

Hi Eric

Well, the dirty deed has been done now however if it causes me a problem as I suspect it will, from yours and others comments, i'll have to bite the bullet and swap them.

Cheers

[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.....