grumpy2 Posted July 19, 2015 Report Share Posted July 19, 2015 my accelerator is really heavy and a bit notchy, makes feathering a bit awkward. Not a massive problem but could I think be improved. So I had a look. I seem to have lots of springs doing different things this is my spring arrangement. Each throttle body has a return hair spring, the accelerator cable arm has one big spring underneath and two smaller ones pulling up. It all works fine and the revs drop to a nice smooth 800rpm at idle, or at least they did.. In an attempt to lighten the pedal I removed the two upwards pulling springs and everything worked perfectly until the engine got really warm after about 20 miles. Gradually the idle speed got higher and higher to about 1800rpm. popped the springs back on and idle back to normal. investigating tonight and it seems that without the upwards springs the butterflies don't close all the way and with them they do. So after my longwinded description I guess I'd like to know if this is correct and is it possible to get the correct closing with a lighter pedal? 72, PI, CP engine. Thanks Gary Quote Link to post Share on other sites
RobinTR6 Posted July 20, 2015 Report Share Posted July 20, 2015 Gary, have you checked the linkage, wear in the bushes is common and the central bush can't easily be replaced. Also the pedal bushes may be worn, worth checking. Lastly here the linkage is bolted to the inlet manifolds may need a bit of fettling to ease he movement of the shaft. Quote Link to post Share on other sites
John L Posted July 20, 2015 Report Share Posted July 20, 2015 On my CP I only have one spring where you have the 2, and the not the one underneath to the manifold. I have put 3 new shaft bushes in recently and also changed to the ball jointed links to the butterfly shaft, works much better now, just a but tricky setting up each set though, but well worth it, at least they now all open together now! John Quote Link to post Share on other sites
grumpy2 Posted July 21, 2015 Author Report Share Posted July 21, 2015 Hi. Thanks for the above. Interested in the ball joint links but only from a position of eliminating play in the system. I should have mentioned that with no springs fitted everything moves freely with no notchiness to play in the bushes. With just the bottom spring fitted the return to idle position works smoothly except for about the last 0,5mm which leaves the butterflies very slightly open with the three springs the butterflies close fully. The throttle bodies are balanced with an airflow meter Thanks Gary Quote Link to post Share on other sites
RobinTR6 Posted July 21, 2015 Report Share Posted July 21, 2015 From what I can see the bottom spring is an extra and looks like the spring for the return of the choke cable. I'd remove it and see how she fares. I have found that I need 2 springs on the upper part of the linkage, when I only had 1 the return to idle when accelerating hard was too slow, ie floor throttle back off to change gear but revs not at idle as clutch engaged so I added a spring as your setup, now fine. Quote Link to post Share on other sites
Denis Posted July 21, 2015 Report Share Posted July 21, 2015 For years I put up with a very light throttle pedal on my CP car, until I simply replaced it with a much stronger one and made it instantly easier to drive in traffic. Quote Link to post Share on other sites
grumpy2 Posted July 21, 2015 Author Report Share Posted July 21, 2015 (edited) I'm going to try a couple of things from the above suggestions first I'm going to try using only the upper springs second I'm going to try changing the linkages to double ball joints. Has anyone tried making their own as £120 for 6 ball joints and some studding seems a bit excessive when bought as a kit. why can't I make my own, parts cost seems under £25. If I do what size ball joins are used? any ideas?? thanks in advance Gary edit;- just found another ball joint kit from Moss at just under £50, anyone have experience of this kit? thanks again Edited July 21, 2015 by grumpy2 Quote Link to post Share on other sites
Kevo_6 Posted July 21, 2015 Report Share Posted July 21, 2015 I'm going to try a couple of things from the above suggestions first I'm going to try using only the upper springs second I'm going to try changing the linkages to double ball joints. Has anyone tried making their own as £120 for 6 ball joints and some studding seems a bit excessive when bought as a kit. why can't I make my own, parts cost seems under £25. If I do what size ball joins are used? any ideas?? thanks in advance Gary edit;- just found another ball joint kit from Moss at just under £50, anyone have experience of this kit? thanks again Hi Gary I have fitted the Moss kit and they work well and are fairly easy to fit & set up. Quote Link to post Share on other sites
grumpy2 Posted July 22, 2015 Author Report Share Posted July 22, 2015 Moss kit bought. Ordered bushes for shaft too. How on earth does the centre one fit? Quote Link to post Share on other sites
Kevo_6 Posted July 22, 2015 Report Share Posted July 22, 2015 (edited) Moss kit bought. Ordered bushes for shaft too. How on earth does the centre one fit? Hi Gary, I think I cut one side of the centre bush and fed it in. Edited July 22, 2015 by Kevo_6 Quote Link to post Share on other sites
grumpy2 Posted July 22, 2015 Author Report Share Posted July 22, 2015 The old one was cut and very worn still hard to remove. All cleaned and painted ready for battle tomorrow. New linkages in the post and bushes ready to fit, what could possibly go wrong!,, Quote Link to post Share on other sites
Kevo_6 Posted July 22, 2015 Report Share Posted July 22, 2015 The old one was cut and very worn still hard to remove. All cleaned and painted ready for battle tomorrow. New linkages in the post and bushes ready to fit, what could possibly go wrong!,, Stay positive Gary it will be fine. Quote Link to post Share on other sites
grumpy2 Posted July 22, 2015 Author Report Share Posted July 22, 2015 Thanks. I'll post an update tomorrow. Malt whisky now for good luck! Quote Link to post Share on other sites
grumpy2 Posted July 23, 2015 Author Report Share Posted July 23, 2015 3 hours in - not going well! Quote Link to post Share on other sites
grumpy2 Posted July 23, 2015 Author Report Share Posted July 23, 2015 Yeehaaa. They're in and balanced. Getting them I was relatively easy but not as easy to blance as I expected Done and road tested Much lighter throttle and nice steady idle. 5 hours well spent in the end Thanks, all Gary Quote Link to post Share on other sites
Kevo_6 Posted July 23, 2015 Report Share Posted July 23, 2015 Yeehaaa. They're in and balanced. Getting them I was relatively easy but not as easy to blance as I expected Done and road tested Much lighter throttle and nice steady idle. 5 hours well spent in the end Thanks, all Gary Well done Gary, now you can drive it like you stole it. Quote Link to post Share on other sites
grumpy2 Posted July 23, 2015 Author Report Share Posted July 23, 2015 I did!, same colour and similar reg to the one in your pic! cheers Quote Link to post Share on other sites
Kevo_6 Posted July 23, 2015 Report Share Posted July 23, 2015 I did!, same colour and similar reg to the one in your pic! cheers Quote Link to post Share on other sites
grumpy2 Posted July 23, 2015 Author Report Share Posted July 23, 2015 thanks for your help Gary Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.