Simos Posted May 23, 2002 Share Posted May 23, 2002 Ooops. Edited by - simos on 23 May 2002 10:57:36 Link to comment Share on other sites More sharing options...
Jam Mad Posted May 23, 2002 Share Posted May 23, 2002 read this here Link to comment Share on other sites More sharing options...
Graham Perry Posted May 23, 2002 Share Posted May 23, 2002 Thats actually quite a useful site Link to comment Share on other sites More sharing options...
eric Posted May 23, 2002 Share Posted May 23, 2002 I like this forum because I have learnt a lot from the experience of the 7 owners Concerning the oil : it is true that 5W50 compare to 15W50 have the same viscosity at hot : 50 But in reality (compare with the theory) a 15w50 will give you a better protection than a 5w50 when hot. The 5w50 will be thinner at cold and will protect your engine better when you start. In theory, the better oil would be a 10w60 (it exists) or a 0w60 (it doesn t exist), but if the difference between the number (60-10)is great, it would mean that you have a lot of additives (less stable)in the oil So from my point of view, it is better to use : a 15w50 versus a 0w50 in a crossflow, if your engine revs above 4000 rev/mn and if you don't leave in the artic area Link to comment Share on other sites More sharing options...
Simos Posted May 23, 2002 Share Posted May 23, 2002 Synthetics don't have additives (long chain polymers) to create the multigrade as the non-synthetics have. Someone's gonna ask why we don't put EP80 in race engines soon. Link to comment Share on other sites More sharing options...
Super_Rich_Bernie Posted May 23, 2002 Share Posted May 23, 2002 What is in Castrol R? It's probably not the best thing for a modern engine but it smells wonderful. Jonathan Link to comment Share on other sites More sharing options...
Phil Posted May 23, 2002 Share Posted May 23, 2002 ERIC a 15w/50 is not thicker than a 0w/50 at full running temp but the same hence the 50 viscosity reading. the 15w/50 is slower moving oil at the cold end hence the 15w part and a 0w is faster giving better protection when cold, the reading for viscosity is taken at minus 20 degrees C but this does not mean use it only if you live at the north pole, even at room temp on a sunny day a 0w oil will move faster because it is purer giving better protection quicker to the top end. the oil will protect at all temps specified between the gradings given 0w cold --------to------hot50 giving a wider range of protection. Link to comment Share on other sites More sharing options...
budgie Posted May 23, 2002 Author Share Posted May 23, 2002 Great chaps loads of info here!My engine is the supersprint type and has done about 4000miles.I notice that RK says only good for about 20000 and that the problem area is the rings/pistons=any more info on this? Link to comment Share on other sites More sharing options...
Phil Posted May 23, 2002 Share Posted May 23, 2002 My 1700SS DD 1990 has run all its life on 10w/40 semi synthetic and since I have had it it has been flushed with wynns engine flush and is know upgraded running on 5w/50 fully synthetic from AC DELCO [DELPHI], it is just coming up to 20 thou and is running fine. Link to comment Share on other sites More sharing options...
Roger King Posted May 23, 2002 Share Posted May 23, 2002 20,000 miles is only a rough guide and depends on driver style and usage. The problem is that the Supersprint pistons are bog standard 1300ccm Escort items and were only intended for about 55bhp. Usually the rings start to lose their seal on the bore or even break. These problems lead to heavier and heavier breathing, oil consumption and even fouled plugs. Basically the engine starts to smell and loses it's edge. In more extreme cases the pistons can break. The worst example I have seen had ring failure at 2000miles and the best lasted for 60,000 miles. 15,000 to 20,000 miles is often a point at which we see an engine for rebuild. The solution is to fit forged pistons which are up to the job and also show a gain of around 8bhp with better throttle response thanks to much lower weight and lower running friction. Link to comment Share on other sites More sharing options...
eric Posted May 24, 2002 Share Posted May 24, 2002 Phil Mine also was running with 10W40 semi and I have a red light alert which warn me when the oil pressure is under 1 bar. With the 10w40, at idle when hot (after 20 miles of motorways at 4000 rev/mn) it was lighten, now whith the 15w50 it never occurs. I use now 15w50 for 6 month and really at idle, the engine sound smoother. I own the car since 1998, and I have just learnt that the former owner use Motul 15w50. As Roger King, Burton, Caterham French race series, French Ford Kent formula all run with 15w50 and I forget Caterham cars recommanding a 15w40 (in the owner manuel) So I decide to do the same. In France, we say : to out-Herold Herold So if your oil pressure is good and you have no over consumption 5w50 could be the oil you need. I wish your are right. Give us news, from my side I use the Caterham every week, all year and I do 10000 miles per year Link to comment Share on other sites More sharing options...
Phil Posted May 24, 2002 Share Posted May 24, 2002 Apologies to every one as reading back through this thread I have been forcing my opinions as to what oil you should be using when the hole point was to clear up a few misconceptions about oil to give people more confidence and knowledge about the products on offer, it seems that most of you are worried about track performance and asume the rest of us are and this quite often strays the conversation,even so a good quality oil will do for both unless you have the luxury of being able to change oil whenever. I will admit to not knowing everything but after years of selling oil and sorting related problems I feel I have a reasonable knowledge of these products only through asking and reading up on specs not normaly released to the public. Thanks for listening and I will carry on using 5w/40 fully synthetic in my car but if I have any problems I will be the first to admit it to you all, anyway the sun is out so guess what I will be doing, have a good trouble free summer and I might see you out there. light blue 1700SS DD 1990 H reg Bournemouth area. Link to comment Share on other sites More sharing options...
budgie Posted May 24, 2002 Author Share Posted May 24, 2002 Rk could I ask about forged pistons? I know of accralite as sold by burtons are these the only forged ones available or are there others (for 1700 crossflow). Link to comment Share on other sites More sharing options...
Roger King Posted May 25, 2002 Share Posted May 25, 2002 Forged pistons are available for the Crossflow in may different capacities from 1600ccm upwards. We have 1800ccm one made specially to take advantage of the AX block. Forgings are/have been available from Accralite, Cosworth, Omega, etc. There isn't much of a problem having a small batch made if required. Advantages over standard Crossflow items are much lower weight, reduced running friction (thanks to modern ring design), ability to rev higher and longer life. Generally, you will see a gain of 5bhp - 8bhp when fitted, as well as better throttle response. Link to comment Share on other sites More sharing options...
Roger King Posted May 25, 2002 Share Posted May 25, 2002 Forged pistons are available for the Crossflow in may different capacities from 1600ccm upwards. We have 1800ccm one made specially to take advantage of the AX block. Forgings are/have been available from Accralite, Cosworth, Omega, etc. There isn't much of a problem having a small batch made if required. Advantages over standard Crossflow items are much lower weight, reduced running friction (thanks to modern ring design), ability to rev higher and longer life. Generally, you will see a gain of 5bhp - 8bhp when fitted, as well as better throttle response. Link to comment Share on other sites More sharing options...
Michael Peterson Posted June 1, 2002 Share Posted June 1, 2002 Roger: What sort of life should one expect from a well cared for SS rebuilt with forged pistons? X-flow equipt Yankee Link to comment Share on other sites More sharing options...
Roger King Posted June 1, 2002 Share Posted June 1, 2002 It's difficult to answer that question without resorting to cliche - 'how long is a piece of string?', etc. This is because the sort of usage the engine is put to varies so much in a 7. I can say that life expectancy should be a lot better than a standard Supersprint engine. Certainly we've seen 60,000 miles plus, although there would be some other mods apart from forged pistons. Valve guides, big end bolts, ignition system, etc spring to mind. Not only do you end up with a longer engine life, but you also see more power and a higher rev limit thanks to lower internal friction, lower reciprocating mass and higher strength. Link to comment Share on other sites More sharing options...
Michael Peterson Posted June 3, 2002 Share Posted June 3, 2002 Is there any special preparation work that needs to be done for a switch from mineral to synthetic, or just change the oil and filter? X-flow equipt Yankee Link to comment Share on other sites More sharing options...
eric Posted June 4, 2002 Share Posted June 4, 2002 I would say : just change the oil and the filter but change every 2000 miles or less (the 2 or 3 first time) to clean the engine. In any case, it cannot do harm to your engine Link to comment Share on other sites More sharing options...
Coose Posted June 4, 2002 Share Posted June 4, 2002 The best forged pistons to fit to a x-flow are from a Zetec. Also, it is required that you fit the crank, rods, block, complete head and sump along with all other ancilliaries. This mod is probably about as expensive as a set of x-flow forged pistons and a good quality rebore! Better still, buy a Fireblade.... Cooooooooose wink.gif Link to comment Share on other sites More sharing options...
Michael Peterson Posted June 5, 2002 Share Posted June 5, 2002 Coose: If it were only that easy. My little X-flow doesnt need an autopsy yet, but I am saving my quid for the Zetec mods. I suppose they run well on synthetic oil.......but that is anothe thread tongue.gif Cheers! Michael X-flow equipt Yankee Link to comment Share on other sites More sharing options...
Coose Posted June 5, 2002 Share Posted June 5, 2002 My x-flow doesn't need an autopsy either, but that's still no reason not to pass it on to someone who can use it and install something more revvy/sequential box equipped.... Coose x-flow equipped limey... wink.gif Link to comment Share on other sites More sharing options...
Coose Posted June 5, 2002 Share Posted June 5, 2002 p.s. Mobil 1 15w/50 is excellent in mine - i.e. it hasn't broken... (1300 stg2 Arrows...) Link to comment Share on other sites More sharing options...
Michael Peterson Posted June 6, 2002 Share Posted June 6, 2002 Coose: We can all aspire to greater (faster, louder...tongue.gif) things. I still love my car the way it is. Not to say I won't change it, perhaps starting this weekend with some Mobil 1.....! Cheers! God I miss the pubs in England sad.gif Link to comment Share on other sites More sharing options...
Coose Posted June 6, 2002 Share Posted June 6, 2002 God I miss the pubs in Holland sad.gif.... Link to comment Share on other sites More sharing options...
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