The Pied Piper Posted January 17, 2002 Share Posted January 17, 2002 Why do users of this forum constantly "slag off" the Jenvey throttle linkage? I have used two of these linkages, one on my existing car and one on a Zetec Seven, both on the Jenvey throttle boddies. Apart from the high cost, I considered it the best linkage I have ever seen, it is very simple, works well and most importantly, it doesn't fall apart. Both have been 100% reliable. The use of a compression spring rather than tension spring seems to create a smooth pedal operation. The pedal is possible slightly heavy but I don't see this as a problem, it's better than a pedal thats too light. I have seen this linkage being slagged off on many threads on this forum but can't understand why. Compared with the many linkages for twin sidedraught carbs I've had experience with over the years ie Magard, Rally Design etc. the Jenvey one is superb. Have I been lucky with mine? is there a design problem? Or do you lot just like being controversial? Rear wheel drive is best! (but sometimes 4WD is better) Link to comment Share on other sites More sharing options...
kenny. Posted January 17, 2002 Share Posted January 17, 2002 How are your shares in Jenvey coming along?? Caterhamless Kenny Link to comment Share on other sites More sharing options...
oilyhands Posted January 17, 2002 Share Posted January 17, 2002 The jenvey linkage works fine with the Weber look-alike bodies where the geometry is carefully worked out, it's a Krypton factor job to assemble if you've not seen one before, but otherwise it's well designed and efficient. However with the DTH bodies things dont work quite so well, there is a *lot* less clearance between the boides for the drop arm, and less space on top due to the design.. these are the ones which attract most criticism. Oily Link to comment Share on other sites More sharing options...
The Pied Piper Posted January 17, 2002 Author Share Posted January 17, 2002 Kenny, yes, the value of the Jenvey share continue to rise! (it certainly feels like you've bought into the company when youve bought as many linkages and throttle boddies as I have!) Oily, thanks, I havn't dealt with the DTH ones yet so I hadn't realised that the deficiencies experienced were based around them. No doubt I'll find out when I get the DTH ones for project Escort Evo "K"! Maybe I'll apply for the Krypton Factor as I had no problem with assembly!! Rear wheel drive is best! (but sometimes 4WD is better) Edited by - The pied piper on 17 Jan 2002 17:42:44 Edited by - the pied piper on 17 Jan 2002 17:43:59 Link to comment Share on other sites More sharing options...
Rob Walker Posted January 17, 2002 Share Posted January 17, 2002 I believe the problem with the Jenvey linkage is that it gives too much peddle travel the leverage/ratio is wrong for the seven. This makes it hard to Heel toe with this linkage. Link to comment Share on other sites More sharing options...
The Pied Piper Posted January 18, 2002 Author Share Posted January 18, 2002 Rob, OK about leverage, I never noticed a problem on my seven, there are two positions for the linkage, the outer one gives nore travel, the inner one less, but obviously makes the pedal heavier. Have to ask JulianS what he thinks since he owns my car now. Maybe the problem with the linkage has been exaggerated on other threads, seeing as I've had little response from this thread! Link to comment Share on other sites More sharing options...
Jason Plato Posted January 18, 2002 Share Posted January 18, 2002 "Maybe the problem with the linkage has been exaggerated on other threads, seeing as I've had little response from this thread!" Whats the problem Pied Piper ??...... oily and Rob have told you what the problems are with the linkage on the DTHTB's , plus of course the cost of it,when you can make your own up for nothing AND use the existing throttle cable with perfect leverage and pressure . Dave Link to comment Share on other sites More sharing options...
julians Posted January 18, 2002 Share Posted January 18, 2002 The pedal travel seems fine to me, not really given much thought to it, so it must be alright. Link to comment Share on other sites More sharing options...
EFA Posted January 18, 2002 Share Posted January 18, 2002 Well I throw the plastic bar and the compression spring away. That gets the pedal weight and feel much better. The pedal travel relative to full range on the throttle bodies is resolved by using the outermost fixing for the linkage to the priomary TB - which dgives more mechganical range o movement. Of course, in a Vauxhall you rarely need the full throttle travel anyway!tongue.giftongue.giftongue.gif Fat Arn The NOW PROVEN R500 Eaterid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Edited by - fat arnie on 18 Jan 2002 10:24:13 Link to comment Share on other sites More sharing options...
Jason Plato Posted January 18, 2002 Share Posted January 18, 2002 Except for 18th May ??wink.gif Link to comment Share on other sites More sharing options...
Red SLR Posted January 18, 2002 Share Posted January 18, 2002 Where is the best place to get a replacement linkage? My TBs have the jenvey one and I dont like it. X777CAT Link to comment Share on other sites More sharing options...
oilyhands Posted January 18, 2002 Share Posted January 18, 2002 Simon, Bernard Scouse does an alternative linkage bracket which gives perfect geometry and pedal weight, he sells them for £10, he is non Elisedrive@aol.com. You dont need the drop arm either, just the cable trunnion. Arnie, Removing the extra spring may be a nice dodge, but you would fail scrutineering at most venues... Oily Edited by - oilyhands on 18 Jan 2002 12:37:03 Link to comment Share on other sites More sharing options...
Chelspeed Posted January 18, 2002 Share Posted January 18, 2002 > Removing the extra spring may be a nice dodge, but you would > fail scrutineering at most venues... Never yet met the scrutineer who wants 5 throttle return springs..... There are individual springs on each throttle body plus this compression spring on the linkage. I too found the throttle pedal too weighty so left this spring off. It was still too much so I went further and took the individual springs off throttle bodies 2 and 3. This leaves me with return springs on 1 and 4, so any part of the linkage breaking will still have a return spring on each side of it. Technically non compliant as the blue book says a spring per spindle but I'm happy it's OK for the above reason. Not failed scutineering on this yet. Link to comment Share on other sites More sharing options...
murph7355 Posted January 18, 2002 Share Posted January 18, 2002 I have DTH's and the QED linkage. Seems OK to me but: - I didn't fit it. - It is "meaty", but I quite like it. - I've had two episodes where a bit of metal has slipped out of place and caused an imbalance in the TBs (and rough running). A slight mod has sorted this hopefully. Not sure if that's linkage specific but think it is. - I had my first cable snap just before Christmas. It's possible that the weight of the linkage puts extra pressure on the cable... - it's definitely not cheap (but I didn't know any better. Besides, I'm the antithesis to Chris Clark. If there's an expensive way I'll inevitably end up taking it!). Ultimately if you can get a perfectly good alternative for about a seventh of the cost of the QED one, then it deserves a good ribbing no matter how suitable it might be! Link to comment Share on other sites More sharing options...
EFA Posted January 18, 2002 Share Posted January 18, 2002 Oily, Chelspeed is right. The spring on each TB satifies the scrutineers as they are not mutually exclusive - i.e. if one breaks the throttles will still all close. Fat Arn The NOW PROVEN R500 Eaterid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Edited by - fat arnie on 18 Jan 2002 19:23:44 Link to comment Share on other sites More sharing options...
Rob Walker Posted January 18, 2002 Share Posted January 18, 2002 Don`t know why anyone bothers with a linkage when fitting jenvey D2HTBs to a K series, all you need is a stay plate bolted onto the side of the head and you have a perfect throttle weight and the ratio remains the same as the Rover which is spot on and this will save you about £80. Its also lighter and has less to go wrong. If ever there was a case for DIY this is it . Edited by - Rob walker on 18 Jan 2002 20:48:58 Link to comment Share on other sites More sharing options...
CHRIS CLARK Posted January 18, 2002 Share Posted January 18, 2002 Andy M. I'm going to print your section of this thread for Suzi Seven to read 'cos she thinks I do it the expensive way too. I keep telling her it's not the case, but she won't believe me! Link to comment Share on other sites More sharing options...
murph7355 Posted January 19, 2002 Share Posted January 19, 2002 I'll turn up at a meet with you both and she can take copies of my bills if you like. It's only money smile.gif Link to comment Share on other sites More sharing options...
Red SLR Posted January 19, 2002 Share Posted January 19, 2002 Thanks Oily, I have e-mailed him to see if I can get one. Simon. X777CAT Link to comment Share on other sites More sharing options...
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