supradibbs Posted October 11, 2009 Share Posted October 11, 2009 What inlet and exhaust valves? Looking for recommendations should i over size? etc etc Currently running fully built block 264 cams with a t78 turbo etc Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 11, 2009 Share Posted October 11, 2009 It's a lot of work and expense fitting over sized valves. The gains will be slight in my opinion. I'd just stay stock. Quote Link to comment Share on other sites More sharing options...
Pig Posted October 11, 2009 Share Posted October 11, 2009 I went with ferrera valves (stock size) as per dusty's advise. I wouldnt oversize valves. From what i have read there are not many places in the uk that can get it right. What are you doing with springs? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 11, 2009 Share Posted October 11, 2009 To be honest there are dozens of places that can do the machining and fit over sized valves, but anywhere good will be costly as it's a time consuming job. More than 1 mm oversize, assuming they'll go in at all, you'll be looking at new seats, which will be VERY expensive. Unless you are building something really trick with a desire to pull huge amounts of power from it, you'll be better served spending the money elsewhere. Quote Link to comment Share on other sites More sharing options...
supradibbs Posted October 13, 2009 Author Share Posted October 13, 2009 I already have Brian crower springs and retainers so have ordered stock size brian crower valves through PHR Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted October 13, 2009 Share Posted October 13, 2009 I was considering the PHR titanium ones to facilitate higher RPM Quote Link to comment Share on other sites More sharing options...
JamieP Posted October 13, 2009 Share Posted October 13, 2009 (edited) I would go with Supertech drop in valves, read a few times that the ferrera valves never fit without machine work. EDIT..... http://www.supraforums.com/forum/showthread.php?t=448887 Edited October 13, 2009 by JamieP (see edit history) Quote Link to comment Share on other sites More sharing options...
T2 MSW Posted October 13, 2009 Share Posted October 13, 2009 I was advised stock as well when my Engine was built. So Stock valves and BC springs in mine. Should be good for a 8000 - 8500 rev limit with the ATI crank pulley and other choice parts. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 13, 2009 Share Posted October 13, 2009 Steel valves and retainers at the sort of size you can fit in a MKIV head are more than adequate for any RPM even a steel short stroke bottom end can survive. Titanium is something you DO NOT want unless the RPM ceiling means steel valves are no longer an option. Titaniom is funny stuff, valves need lifing, they just suddenly fail, they don't stretch, and the retainers don't crack. They just go BANG!!! Spend the money on good valve springs. The best ones usually come from Germany or Japan, not the USA Quote Link to comment Share on other sites More sharing options...
T2 MSW Posted October 13, 2009 Share Posted October 13, 2009 Steel valves and retainers at the sort of size you can fit in a MKIV head are more than adequate for any RPM even a steel short stroke bottom end can survive. Titanium is something you DO NOT want unless the RPM ceiling means steel valves are no longer an option. Titaniom is funny stuff, valves need lifing, they just suddenly fail, they don't stretch, and the retainers don't crack. They just go BANG!!! Spend the money on good valve springs. The best ones usually come from Germany or Japan, not the USA Is that from experience Chris, or just best practice as a rule of thumb?? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 13, 2009 Share Posted October 13, 2009 I have experience of how Ti valves fail, yes, as do most race engine builders.They are just totally OTT for the application, you are wasting money on something that's not only unnecessary, but potentially less reliable than a cheaper option. They'll probably poor quality anyway, decent race spec Ti valves are serious, serious money. So are decent race quality springs, as my bank account knows only too well this month Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted October 13, 2009 Share Posted October 13, 2009 Ok, no longer considering Ti valves Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 13, 2009 Share Posted October 13, 2009 Honestly, there is zero need. After market Ti rods, Ti retainers, Ti valves, they all need lifing. I have Ti rods in this Mugen, and they crack test and size up perfectly. I know they are well over their 36 hour life though, so even at 4500 quid for an "old stock" new set the thing's having them. It would be sheer madness to run them longer. OK, some road car engines have Ti valves, like the Toyota 4 pot Altezza BEAMS engine, but they use them to reduce friction by running a very light valve spring and small cam buckets. Steel valves with steel retainers are what you want. The question you SHOULD be asking are are after market steel valves one piece, or welded? You want one piece valves in a high performance engine. Many are not! Quote Link to comment Share on other sites More sharing options...
T2 MSW Posted October 13, 2009 Share Posted October 13, 2009 Oh well, ill just forget I read that. If they go wrong i just wont be using them again Quote Link to comment Share on other sites More sharing options...
Kirk Posted October 13, 2009 Share Posted October 13, 2009 stock ftw Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 13, 2009 Share Posted October 13, 2009 Are stock MKIV TT exhaust valves sodium filled? I have never cut one open to check, but suspect they will be, as Skyline ones definitely are. That's why people make aftermarket stuff that sounds great, has an appealing price tag, but is often very inferior to OE stuff. I am buying stainless braided hose and hose fittings for my Skyline fuel system. Ebay throws up fittings at near 1/2 the price of Speedflow. They LOOK the same, exactly the same, but they aren't. The hose has only an outer stainless braid, of very fine wire. the inner braid is part galvanised steel and part (and you can be damned sure, a tiny part, stainless. the fittings have no material spec, and the anodising is so thin as to be a joke. Faye at Speedflow sells a decent spec at a fair price, and even a budget build would be well served using less. Genuine XRP and Aeroquip is more expensive still, but still better specced. You need to ask the right questions, especially with things as stressed as valve springs, probably the most highly loaded parts in a high(ish) RPM engine. Heard of a stock spring breaking, even at mega mileages? No, neither have I Quote Link to comment Share on other sites More sharing options...
T2 MSW Posted October 13, 2009 Share Posted October 13, 2009 Ill keep the revs down then Quote Link to comment Share on other sites More sharing options...
Kirk Posted October 13, 2009 Share Posted October 13, 2009 pussy ! Quote Link to comment Share on other sites More sharing options...
T2 MSW Posted October 13, 2009 Share Posted October 13, 2009 pussy ! You did not have to pay the bill having it built my eyes will water alot if anything happens to it:cry: Quote Link to comment Share on other sites More sharing options...
Kirk Posted October 13, 2009 Share Posted October 13, 2009 (edited) should off stayed with stock then so what your saying chris is stock valvetrain is as BETTER than the aftermarket stuff for high rpm applications? Edited October 13, 2009 by Kirk (see edit history) Quote Link to comment Share on other sites More sharing options...
dandan Posted October 14, 2009 Share Posted October 14, 2009 Are stock MKIV TT exhaust valves sodium filled? I have never cut one open to check, but suspect they will be, as Skyline ones definitely are. If MG managed to suss out the cooling properties of sodium filled valves in their turbo A series'd Metro then I'd hope Toyota would be at least on a par! p.s. I haven't forgotten about suspension kit...I'm just getting the single kit installed first so I'll be in touch once I have the car back on the road. Quote Link to comment Share on other sites More sharing options...
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