Carlos Prangdango Posted May 13, 2009 Share Posted May 13, 2009 I have heard much about the benefits of vernier pulleys, but never from anyone who has actually fitted them. I understand the principle behind them and it seems only logical, but are there really noticible gains to be had here??? What improvment can I expect to see if I choose to fit them to a K 1.6 SS? Question 2, if I do decide to fit vernier pulleys, where is the best place to purchase them from? Link to comment Share on other sites More sharing options...
CageyH Posted May 13, 2009 Share Posted May 13, 2009 They will transform the drivability of your car, making engine pick up better and smoother, as the valve/cam timing will be closer to what it should be when set up. Speak to Oily on here. Only dead fish go with the flow....! Link to comment Share on other sites More sharing options...
Myles Posted May 13, 2009 Share Posted May 13, 2009 Hmm - well, the magnitude of the benefits depend on how far out your standard pulleys are in the first place, surely. It's worth measuring the lift you've got before shelling out - if that's the only modification you're making. 🙆🏻 🙆🏻 🙆🏻 🙆🏻 🙆🏻 Alcester Racing 7s Ecosse™ 🙆🏻 🙆🏻 🙆🏻 🙆🏻 🙆🏻 Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
The Polisher Posted May 13, 2009 Share Posted May 13, 2009 The inlet cam timing is so far out some engines that rotating the pulley one tooth can give almost the same gains as fitting vernier pulleys without the cost. Like Myles suggests, check the current timing to see if this is feasible. I have made this adjustment to a few engines with excellent results. Dave H. Mad about S77ENS Link to comment Share on other sites More sharing options...
Graham King Posted May 14, 2009 Share Posted May 14, 2009 Mr Fab, see here, this is mt write up of initial impressions haveing had them fitted a while ago. If you have any questions please feel free to ask. I purchased mine from Dave Andrews. Graham. R7 GPK Superlight #85 Link to comment Share on other sites More sharing options...
Johnty Lyons Posted May 14, 2009 Share Posted May 14, 2009 Some folk see dramatic improvement others hardy any Just goes to show how uninterested Rover where in the original set up As has been said some where nearly a tooth out. I started of with off set dowels to correct the Timing and Only went to Verniers on a bigger cam and head change later It's all on DVAs site jj N.I. L7C AR 🙆🏻 Membership No.3927. 240BHP 1900cc K Series 40th Anniversary Link to comment Share on other sites More sharing options...
John Howe Posted May 14, 2009 Share Posted May 14, 2009 Having fitted quite a few of them for Club members, I have to say that it is a no brainer, for the simple reason that the manufacturing tolerances of the original engine leaves much to be desired. The down side is that you can't just buy and bolt them on, but rather you need to beg borrow or steal the appropriate gauges to establish the correct valve timing. You profile lacks a location but if you are any where near the farm I'd be pleased to fit and time them for you. ... if you want a reference statement - assume you are currently running some 5% out on your timing! JH Deliveries by Saffron, the yellow 230bhp Sausage delivery machine Link to comment Share on other sites More sharing options...
7ERRY Posted May 14, 2009 Share Posted May 14, 2009 John did my sons he would agree much better long suffering father of K16TOY (THE DOUGHNUT KID !!!!!) Link to comment Share on other sites More sharing options...
Team Escargot Posted May 14, 2009 Share Posted May 14, 2009 Just had mine done by Dave Andrews (DVA) - 20 deg out! on my R300 (probability making it an R100). Fantastic job by Dave - very noticeable improvement mid range (4000 rpm and above) and now goes like a proper 300. Link to comment Share on other sites More sharing options...
millsn Posted May 14, 2009 Share Posted May 14, 2009 Having speed read something recently on what used to be cars and car conversions Mr Walker gives them some credence. It seems that any one engine/manifold/cam/exhaust manifold combo is unlikely to be the same as another. Therefore it is often beneficial to be able to swing the cam timing on the rolling road to allow for this. The cam manufacturers are unlikely to have been able to predict what your exact installation was going to look like so they make an estimate of what should work well when they spec the timing. what your own engine sees is unlikely to be what they predicted and you may well benefit from subtely changing the timing accordingly. Or something like that. I'm going to watch some telly now and have a lie down. Edited by - millsn on 16 May 2009 08:59:43 Link to comment Share on other sites More sharing options...
oilyhands Posted May 14, 2009 Share Posted May 14, 2009 It's nothing to do with the manufacturers estimate, it is to do with the sloppy tolerances in the drivetrain. The published firgures for the manufacturers spec. timing are completely different from what is actually acheived. Oily Link to comment Share on other sites More sharing options...
millsn Posted May 15, 2009 Share Posted May 15, 2009 ta Link to comment Share on other sites More sharing options...
Carlos Prangdango Posted May 15, 2009 Author Share Posted May 15, 2009 Well, thanks for all your replies. My decision has been swayed, (didnt take much persuading!), vernier pullies it is. The cam carriers coming out soon anyway to replace a noisey follower and inspect for anything else untoward causing the tapping/rattle noise, and the cam belts due a change. Should be enough there to keep me in the garage for the day. Link to comment Share on other sites More sharing options...
Mark w Posted May 15, 2009 Share Posted May 15, 2009 Another for DVA Link to comment Share on other sites More sharing options...
martinwhitcher Posted May 15, 2009 Share Posted May 15, 2009 go see Dave, you know it makes sense Martin MW 51 CAT Superlight No.171 now known as:Superlight DVA 250 Link to comment Share on other sites More sharing options...
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