prs Posted February 6, 2003 Share Posted February 6, 2003 I'm about to fit one of these systems and have noticed threads discussing the extra fitting of a one way valve in the top braided hose which returns to the cam cover. Am I right in thinking that the fitment of a valve will stop the oil draining back into the sump, presumably it keeps the oil back through vacuum pressure? If this is the case then on start up oil pressure should be instant rather than the slight delay without. Does anybody know how effective this is and where I can get such a valve. cheers Phil Link to comment Share on other sites More sharing options...
PAUL MARRIOTT Posted February 6, 2003 Share Posted February 6, 2003 Very effective, I started my beast up last night for the first time in about 8 weeks (since they started salting!!)and got pressure immediately, dead easy to fit. You can get them from Think Automotive, a search should turn up the details Paul M. Link to comment Share on other sites More sharing options...
SJL Posted February 6, 2003 Share Posted February 6, 2003 I can also confirm this mod works a treat ! Get the bits from Think for approx £60 Link to comment Share on other sites More sharing options...
Bob Corb Posted February 6, 2003 Share Posted February 6, 2003 Ditto From Think Product code Product Description MFA7-3-4 ALI M/F ST -3JIC X -4JIC HETF97-3 -3JIC 90o FITTING FOR -3TFE FBM2099 ALLOY BULKHEAD NUT -4JIC CVF7 ONE WAY VALVE FLAP -4JIC Mention 7 club you may get a discount. BC Link to comment Share on other sites More sharing options...
KenEvans Posted February 6, 2003 Share Posted February 6, 2003 Are we sure it doesn't reduce the effect of the Apollo tank by restricting the airflow into the cam cover? Having installed an Apollo tank the top end still sounded a bit unlubricated on fast (track day) right handers, albeit not so much as before. I'd be concerned that the one way valve reduces its air clearing ability. If it's a good idea why doesn't a one way valve come with the Apollo kit? (and why did Caterham sell me a car that can't do fast right handers without eventually trashing the cams?) Ken Edited by - kenevans on 6 Feb 2003 17:29:14 Link to comment Share on other sites More sharing options...
Support Team Shaun_E Posted February 6, 2003 Support Team Share Posted February 6, 2003 How easy to fit? Is it just a case of unscrewing one end of the pipe, screwing in the valve and screwing the valve to the cam cover? Why don't Caterham fit this as standard and is it likely that damage is caused if you don't have one? I have just had an Apollo fitted by Caterham and if it is easy then I would like to fit a one way valve. Does anyone have a picture? Shaun Yellow SL #32 Link to comment Share on other sites More sharing options...
CHRIS CLARK Posted February 7, 2003 Share Posted February 7, 2003 Shaun_E Send me your email and I'll fwd a pic or two! As to restricting flow Ken.......well only on the return which ain't gonna happen until you turn the engine off! I asked Caterham why they didn't fit the unit too after completing my mod about a year ago. Was told it was a cost thing!!! Works out at about 50ukp. Worth every penny for my piece of mind!!! Clamshell Club Founder Member. Link to comment Share on other sites More sharing options...
John_Salmon Posted February 12, 2003 Share Posted February 12, 2003 Try inline check valve from RS components, catalogue no. 237-2442. Price: £11.67 Purchase end fitting to suit. It works well on my VX and maintains oil pressure on startup. Link to comment Share on other sites More sharing options...
Dave_H Posted February 18, 2003 Share Posted February 18, 2003 That RS check valve seems like good value (not that I'm a tight git or anything). According to their site it needs a 0.35 bar opening pressure, that seems quite high. The question is, is it too high to let air out of the apollo tank Anyone’s thoughts appreciated. Dave Edited by - Dave_H on 18 Feb 2003 11:27:15 Link to comment Share on other sites More sharing options...
Peter Carmichael Posted February 18, 2003 Share Posted February 18, 2003 The Apollo tank is running at 3-4 bar, so no problem with opening the valve. The only issue might be that a spring loaded valve has a very different effect on flow rates compared to an open restrictor. The restrictor is quite a clever device. It flows at different rates depending on the viscosity of the fluid that is attempting to get past. When the Apollo is full of oil, the restrictor doesn't let much oil get out. When the Apollo has caught some air, the air is low viscosity so whistles through the restrictor much quicker. A spring loaded valve (consider your oil pressure relief valve, or your fuel pressure regulator) maintains a pressure drop (if it is within its operating range). It does this regardless of the fluid viscosity, so when air (instead of oil) is venting, the valve will close down to a smaller opening in order to maintain the pressure. In the Apollo tank installation, this slows down the rate at which air is expelled from the tank. I have been able to observe this effect on datalogs, but came to the conclusion that I preferred oil pressure at startup. Link to comment Share on other sites More sharing options...
Dan J Posted February 18, 2003 Share Posted February 18, 2003 Peter, Would this here therefore be a better choice? Dan Fury K series Warrior 1400 151bhp 😬 Link to comment Share on other sites More sharing options...
Dave_H Posted February 18, 2003 Share Posted February 18, 2003 Many thanks Peter So basically, a flap valve would be better, but a sprung check valve is ok, and it won’t bug*er the engine. Cheers, Dave Link to comment Share on other sites More sharing options...
MartinS Posted September 17, 2009 Share Posted September 17, 2009 Hi, I've been advised by Dave Andrews to fit a one way valve, would you guys be kind enough to confirm I need all these bits: From Think Product code Product Description MFA7-3-4 ALI M/F ST -3JIC X -4JIC HETF97-3 -3JIC 90o FITTING FOR -3TFE FBM2099 ALLOY BULKHEAD NUT -4JIC CVF7 ONE WAY VALVE FLAP -4JIC 🤔 Cheers M. ------------------------------- Martin Saunders DVA Power 1.8SS - upgradeitus finally bit me! Link to comment Share on other sites More sharing options...
MartinS Posted September 19, 2009 Share Posted September 19, 2009 Might BTTT tashis incase it wasn't spotted M. ------------------------------- Martin Saunders DVA Power 1.8SS - upgradeitus finally bit me! Link to comment Share on other sites More sharing options...
MartinS Posted September 24, 2009 Share Posted September 24, 2009 Anyone any ideas? I tried calling Think and although the guy was useful he didn't have any idea if this collection of parts would go together? M. ------------------------------- Martin Saunders DVA Power 1.8SS - upgradeitus finally bit me! Link to comment Share on other sites More sharing options...
MartinS Posted July 1, 2010 Share Posted July 1, 2010 I still think I should get this sorted out. Has anyone else purchased these parts recently and can confirm it all works? M. ------------------------------- Martin Saunders DVA Power 1.8SS - upgradeitus finally bit me! Link to comment Share on other sites More sharing options...
BBL Posted July 1, 2010 Share Posted July 1, 2010 Martin, There is an article in the October 2008 issue of Racecar Engineering magazine recommending the use of a flap valve as described above. It works, but I don't know where you might be able to source the parts. YHBM Sean Link to comment Share on other sites More sharing options...
Support Team c7trp Posted July 1, 2010 Support Team Share Posted July 1, 2010 I've just done it and it works a treat No more rattly tappets when it fires up Speak to Matt (?) at Think - he knows the bits you need to splice it into the existing braided hose. Easy to do... Edited to say - I can get a list of the parts I used on Friday if that helps... Edited by - Tim Pollard on 1 Jul 2010 21:22:07 Link to comment Share on other sites More sharing options...
MartinS Posted July 1, 2010 Share Posted July 1, 2010 Hi Tim, If you wouldn't mind that would be great, yes please. When I spoke to Think they didn't really know what I was on about! Many thanks in advance M. ------------------------------- Martin Saunders DVA Power 1.8SS - upgradeitus finally bit me! Link to comment Share on other sites More sharing options...
jradley Posted July 1, 2010 Share Posted July 1, 2010 You do specifically need to speak to Matt at Think. When I did this back in February he offered me a number of different options. The one I went for, which is the most expensive but most convenient, was a complete hose assembly that directly replaced the original supplied hose but it has the one way valve in-line with it. That way I didn't have to make up any joints or split the existing hose. I can get a photo later if you like. If you speak to Matt tell him he can reference order number OR262444 for reference. Cheers, John Link to comment Share on other sites More sharing options...
BBL Posted July 2, 2010 Share Posted July 2, 2010 I found a couple of sources for the valves, but they are in the US, not in the UK: Earl's here Paragon here edit -- Think Automotive catalog here (flap valves about half-way down the page) Best of luck. Sean Edited by - BBL on 2 Jul 2010 06:58:30 Link to comment Share on other sites More sharing options...
MartinS Posted July 2, 2010 Share Posted July 2, 2010 Great, thanks very much everyone 😬 ------------------------------- Martin Saunders DVA Power 1.8SS - upgradeitus finally bit me! Link to comment Share on other sites More sharing options...
Support Team c7trp Posted July 2, 2010 Support Team Share Posted July 2, 2010 Part numbers of items I used: CVF7-4 1 way flap valve -4JIC (1 No.) HETF7-4-3 -4JIC FML Straight for -3TFE (2 No.) The document number on my bill is SI303105 / OR267524 (6/5/2010) Matt is the best contact. Took about half an hour to cut the existing hose and add the valve in. HTH Edited by - Tim Pollard on 2 Jul 2010 08:55:25 Link to comment Share on other sites More sharing options...
Roadsport06 Posted July 4, 2010 Share Posted July 4, 2010 John, can you remember how much your direct replacement top hose with in line one way valve set up was. I'd be interested in a photo too. Many thanks BRG and Yellow nose now with added brooklands Link to comment Share on other sites More sharing options...
Gary Stone Posted July 4, 2010 Share Posted July 4, 2010 I did this mod about 3years ago after James Whiting recommended it.He also sells all the bits you need. Superlight R'66 GMS 'Flying Very Low'... Link to comment Share on other sites More sharing options...
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