Andy A Posted January 17, 2007 Share Posted January 17, 2007 Jenvey throttle cable linkage preferably with mounting for DTH. Someone must have one? Link to comment Share on other sites More sharing options...
The Polisher Posted January 19, 2007 Share Posted January 19, 2007 I dont know exactly what you are looking for but I have 4 throttle 'quadrants' that I had machined out of aluminiun. These screw to the existing lever arm with 2- M4 capscrews and have a profile very similar to the standard 52mm TB. These use the standard cable and nipple in conjunction with the Jenvey bracket and provide a progressive throttle action by using a reducing active radius. Dave H. Mad about S77ENS Link to comment Share on other sites More sharing options...
Jason Plato Posted January 20, 2007 Share Posted January 20, 2007 Ohhh could I buy one of your 4 quadrants please ? could you please send me a picture and a price . sorry for the hyjack Dave ps - Andy you are better off with a Bernard scouse throttle bracket for a K than a Jenvey throttle cable underslung lever . these are also available from Dave Andrews here is C7 TOP Taffia Area Rep Link to comment Share on other sites More sharing options...
The Polisher Posted January 20, 2007 Share Posted January 20, 2007 Dave, I will sort out a photograph on Monday as my camera is at work. They cost me £30 each to get made so that is the price to you plus £1 p&p. Dave H. Mad about S77ENS Link to comment Share on other sites More sharing options...
CageyH Posted January 20, 2007 Share Posted January 20, 2007 QED will probably be able to help with what you are looking for Andy. Only dead fish go with the flow.... Link to comment Share on other sites More sharing options...
Andy A Posted January 20, 2007 Author Share Posted January 20, 2007 Dave - I havent seen the Bernard Scouse kit, but if it's not specific to the airbox (and fits presumably on the Jenveys since the manifold studs would be different on a K to my VX) then maybe its OK? Can you say why it would be better? Link to comment Share on other sites More sharing options...
Mark Ferguson Posted January 20, 2007 Share Posted January 20, 2007 Think I have one of these, will dig it out & take picture for you. Bought it from QED direct but never used it. Link to comment Share on other sites More sharing options...
Andy Best Posted January 20, 2007 Share Posted January 20, 2007 Polisher Daves quadrants are just what the Jenveys need you do need a bracket like the one Bernard makes, but this would be easy for anyone to make for non K heads. Andy Link to comment Share on other sites More sharing options...
Tony C Posted January 20, 2007 Share Posted January 20, 2007 IMHO that Bernard scouse throttle bracket is a piece of poop. I took one look at it and left it with Oily. It does work, but doesn't cater for the rotation of the butterfly spindle, so the outer cable describes an arc every time you move the pedal and the inner must move laterally. The Jenvey throttle linkage isn't cheap, but is an excellent piece of engineering. The butterfly return spring(s) push to close, rather than pull, so will close the throttle even if they break. They also give a slight degree of exponential opening of the butterfly's the further you push the pedal. But, as has recently been mentioned on the Duratec thread - you get what you pay for BRG Brooklands SV 😬 It seems that perfection is achieved not when there is nothing more to add, but when there is nothing more to take away. (Antoine de Saint-Exupery) Link to comment Share on other sites More sharing options...
Andy A Posted January 20, 2007 Author Share Posted January 20, 2007 Mark, I'm interested. Thanks. Tony - certainly drawings of the Jenvey bracket make it look pretty complicated, almost over-engineered, but it does look like the right bit of kit. Thanks for the comparison. I presume it doesnt need any additional spring or throttle stop? Link to comment Share on other sites More sharing options...
Tony C Posted January 20, 2007 Share Posted January 20, 2007 When I fitted the single spring version to my DTHTB's and was opening the throttle by hand, I felt that there was too much return tension and removed one of the rotary springs from a TB. Obviously there is more force available from your foot on the pedal - duh. It wasn't too light, but it is fine with the two rotary springs and the Jenvey linear spring. Luckily Jenvey sell replacement rotary springs for their TB's, so I've since refitted it. My feeling is that you do NOT want the throttle to stick open, so the more redundancy the better - not too much total spring tension though BRG Brooklands SV 😬 It seems that perfection is achieved not when there is nothing more to add, but when there is nothing more to take away. (Antoine de Saint-Exupery) Link to comment Share on other sites More sharing options...
Andy A Posted January 20, 2007 Author Share Posted January 20, 2007 One aspect that looks like it might be awkward is the diagonal cross-brace tube that runs right under the linkage point on the bodies. I presume this doesn't this get in the way of the underslung linkage? Link to comment Share on other sites More sharing options...
Tony C Posted January 20, 2007 Share Posted January 20, 2007 Mine's an SV, so you'll have to ask someone with a narrow 7 BRG Brooklands SV 😬 It seems that perfection is achieved not when there is nothing more to add, but when there is nothing more to take away. (Antoine de Saint-Exupery) Link to comment Share on other sites More sharing options...
Ian R Posted January 20, 2007 Share Posted January 20, 2007 Andy I'm just converting my VX to TBs and I made this bracket from a SBD provided diagram. This uses an underslung cable as before, but I had to slightly move it as it wanted to go through the middle of the new air filter! I puchased a 'slick' BMX bike cable and ran a big loop down and under the filter, then added an extra return spring. Picture of bracket in here. http://rides.webshots.com/album/556975688MXEbeI http://community.webshots.com/user/ianmreynolds Ian (If you want to go faster, you will have to add lightness!) Edited by - Ian R on 20 Jan 2007 19:52:07 Link to comment Share on other sites More sharing options...
Andy A Posted January 20, 2007 Author Share Posted January 20, 2007 Ian, that looks a very neat installation. Watch out for blatmail with seperate questions My TBs are DTH so maybe a different bracket required but worth looking into. Hoping to hear from Mark on the jenvey linkage. I see you've been doing some porting too. Link to comment Share on other sites More sharing options...
Ian R Posted January 20, 2007 Share Posted January 20, 2007 Andy Thanks. Head came with the porting, was a surprise to me when I saw it! I dont actually know what a std head looks like so don't know what has really been done. Also found when I went to change the rod bolts that they had been done too! Looks like the rods had been tinkered with and slightly deeped cutouts on the piston crowns. Surprisingly the cams were standard, these I had reground by Kent to the first mild increase on the std cams, should give extra 15bhp. Got a bit of wiring to finish and but the sump back on.... then see if it starts!! Goodness knows what you do it it doesn't?!? Blatmail goes to my work mail, I'll check that Sunday, my home email is "ian.m.reynolds@btinternet.com" Ian Link to comment Share on other sites More sharing options...
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