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Hart plenum & LHD ABS
Hello guys !
First thread from me ! I'm trying to set a hart plenum on my 2WD LHD Sapphire. I got a problem about the gap between the plenum and the ABS unit. https://i33.servimg.com/u/f33/12/43/10/09/093410.jpg https://i33.servimg.com/u/f33/12/43/10/09/093810.jpg On LHD, we have a plate to fin. Behind the plate, we have the 6 ABS valves and about 100 bar of brake fluid pressure. I think the modification should be done properly. The only thread giving a solution is this one: https://passionford.com/forum/restor...00-hp-4x4.html http://www.ktm-stuntrider.nl/cosworth/car/104.JPG I would like to know if someone know people using to do such a plate. Thank you ! Regards ! Romain |
Hi and welcome.
Do you need to remove the ABS unit to get the hart in there? If not surely you can add the nut to the thread and then add the plenum? (seems to simple so assume you cannot) If not I think you need to remove the thread and have it drilled and tapped for a bolt to go in - surely that would give you the room. OR I wonder if Mark Shead could tell us if it would have a dramatic negative affect to machine a dimple in to the inlet to allow clearance, maybe have a few mill skimmed off the flange face of the inlet where it meets the head as well? |
You can probably move the whole pedal box a few mil as well but that would mean ovalling the holes and somehow re-sealing the bulkhead
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Originally Posted by Caddyshack
(Post 6796747)
You can probably move the whole pedal box a few mil as well but that would mean ovalling the holes and somehow re-sealing the bulkhead
Originally Posted by Caddyshack
(Post 6796746)
Hi and welcome.
Do you need to remove the ABS unit to get the hart in there? If not surely you can add the nut to the thread and then add the plenum? (seems to simple so assume you cannot) If not I think you need to remove the thread and have it drilled and tapped for a bolt to go in - surely that would give you the room. I tried by removing everything between the plenum and the cylinderhead including all the studs. I haven't removed the ABS unit. On the two first pics, the plenum is set, the only question is about the room to put all the studs in the cylinderhead threads. If I am worried about the clearance it's about the engine movements. As you can see, I got about 2mm of clearance.
Originally Posted by Caddyshack
(Post 6796746)
OR I wonder if Mark Shead could tell us if it would have a dramatic negative affect to machine a dimple in to the inlet to allow clearance, maybe have a few mill skimmed off the flange face of the inlet where it meets the head as well?
https://i.ebayimg.com/images/g/nX4AA...zz/s-l1600.jpg Few pics of my car: https://i33.servimg.com/u/f33/12/43/10/09/c110.jpg https://i33.servimg.com/u/f33/12/43/10/09/c210.jpg |
Yes, I can see that the engine movement could knock it and break something, you do not want to ruin either. I am sure a good fabricator could make one of those covers for you.
Moving the pedal box 5/10 mm might be the easiest and cheapest option and easily reversed. |
Alternatively you can get a RHD brake booster or one from LHD Escort Cosworth (harder to come by). They provide much more clearance as they dont have that big block on the side.
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Originally Posted by Caddyshack
(Post 6796786)
Yes, I can see that the engine movement could knock it and break something, you do not want to ruin either. I am sure a good fabricator could make one of those covers for you.
Originally Posted by Caddyshack
(Post 6796786)
Moving the pedal box 5/10 mm might be the easiest and cheapest option and easily reversed.
Originally Posted by nixon_2wd
(Post 6796788)
Alternatively you can get a RHD brake booster or one from LHD Escort Cosworth (harder to come by). They provide much more clearance as they dont have that big block on the side.
Good idea ! I will try to find pics about ABS bloc from LHD escort and 4x4 sapphire to see the differences. I supposed that the block valve is separeted from the whole ABS unit like with RHD ABS block. |
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I can see that the Jaguar XJS is equiped with a similar TEVES ATE MK2 ABS system.
I can also see they get a remplacement valve block with a very thin cover: https://www.jagroverland.com/abs-mod...1475-open-box/ The cover seems to retain the valves: https://www.jaguarforums.com/forum/x...l-left-113913/ |
I presume that is a stud in the first photo ?
Just remove it and fit a shallow head bolt as per the lower fastener in the photo ? Or just shorten the threads of the stud and use a half nut. And ensure good strong engine mounts. or as others said, just move it a little to the side, even a small spacer giving the unit a small angle would not hurt how it operates, but would give you additional clearance at the manifold side. |
Originally Posted by stevieturbo
(Post 6796875)
I presume that is a stud in the first photo ?
Just remove it and fit a shallow head bolt as per the lower fastener in the photo ? Or just shorten the threads of the stud and use a half nut. And ensure good strong engine mounts.
Originally Posted by stevieturbo
(Post 6796875)
or as others said, just move it a little to the side, even a small spacer giving the unit a small angle would not hurt how it operates, but would give you additional clearance at the manifold side.
The kind of plate I would like to find: Volvo 480: https://i1146.photobucket.com/albums...psed6707b5.jpg Remplacement block for Jaguar XJS: https://cdn11.bigcommerce.com/s-xjga...=2?imbypass=on |
Looks good. Very clean too.
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