Valve springs
- Thread starter BRUSHED
- Start date
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rob323
Don't drive it, RALLY it!
Firstly, what makes you think you need to upgrade the valve springs?
Secondly, use the valve springs which suit the cams you are running.
ie. stock cams = stock valve springs.
high lift cams = valve springs to suit (preferably as supplied by the cam manufacturer).
Secondly, use the valve springs which suit the cams you are running.
ie. stock cams = stock valve springs.
high lift cams = valve springs to suit (preferably as supplied by the cam manufacturer).
The guy that's building the engine said that I should be running a better valve spring to handle the boost because of the pressure that will be put on them due to more boost. Obveiously no one has changed them so will have to source info elsewhere, thanks guys
rob323
Don't drive it, RALLY it!
That doesn't make a lot of sense to be honest. Boost helps seal the valves to the head which is also what the valve springs do.
The only reason you change valve springs is if you are running high rpm (very often) or have different cams which have greater lift and require different seat pressure or the stock springs will coil bind under the extra lift.
Is your engine builder experienced with Mitsi stuff, or is he just used to Ford and Holden stuff (where valve spring upgrades are very common due to the stick soft springs that they use that will cause valve float at high rpm)?
What cams you are running?
The only reason you change valve springs is if you are running high rpm (very often) or have different cams which have greater lift and require different seat pressure or the stock springs will coil bind under the extra lift.
Is your engine builder experienced with Mitsi stuff, or is he just used to Ford and Holden stuff (where valve spring upgrades are very common due to the stick soft springs that they use that will cause valve float at high rpm)?
What cams you are running?
brisvr4
Member
As rob said. STD cams = STD valve springs.
Unless you are planning on revving it very high.
Unless you are planning on revving it very high.
What brushed is saying can apply depending on the standard spring seat pressure, it is certainly a good idea to upgrade the springs even with stock cams if your going big boost.
They way to check is get your original spring seat pressure checked first, if its high you dont need them,
but I take it your engine guy has checked them or he wouldnt have mentioned it.
brian crowers are cheap and chearful and run a good seat pressure, thats what I would go for if you can.
edit : not sure if you can get them for 4g93???
They way to check is get your original spring seat pressure checked first, if its high you dont need them,
but I take it your engine guy has checked them or he wouldnt have mentioned it.
brian crowers are cheap and chearful and run a good seat pressure, thats what I would go for if you can.
edit : not sure if you can get them for 4g93???
+1
I have 320hp atw with standand cams with "rpw" valve springs on a 93T :blink:
khubner1
Moderator
my valve spring are standard items that have shimms placed somwhere on them to bring them back up to spec.
youda
Well-Known Member
im pretty sure 63t valve springs fit in a 93 can anyone else back me up here.
GSRWRC
I am The Stigs fat cousin
I have Kelford 212-B billets and stock valvesprings. As already mentioned, they're only required with 'big' cams. Namely stuff you can't even get off the shelf for the 93T. Sounds like "the guy putting your engine together" doesn't really know what he's doing and/or is trying to sell you stuff you don't need.
Wrong.
Wrong.
Thread revive
Originally I was using Tomei 260/260 in my 4G63T engine, recently I have changed to HKS 272/272
Only problem is I have no idea what the ones currently in my head are, OEM or aftermarket
I don't think they are stock, when I got the engine it had Tomei Cams, Tomei Cams gears, Tomei Timing belt/balance belt, EVO7+ rockers, 3G lifters, Stainless valves... I don't see a point it they upgrade them parts but not the springs
They worked fine with the 260/260 Tomei Combo, which has 10.7 lift, while the HKS 272/272 has 10.8
Do they look like an stock item or an aftermarket??
Does anyone know what they could be??
They have pink paint on the tops
Originally I was using Tomei 260/260 in my 4G63T engine, recently I have changed to HKS 272/272
Only problem is I have no idea what the ones currently in my head are, OEM or aftermarket
I don't think they are stock, when I got the engine it had Tomei Cams, Tomei Cams gears, Tomei Timing belt/balance belt, EVO7+ rockers, 3G lifters, Stainless valves... I don't see a point it they upgrade them parts but not the springs
They worked fine with the 260/260 Tomei Combo, which has 10.7 lift, while the HKS 272/272 has 10.8
Do they look like an stock item or an aftermarket??
Does anyone know what they could be??
They have pink paint on the tops
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evo-gsr
Well-Known Member
Do you really think 0.1 more lift will really make any difference what so ever?? The way I see it if they could handle 10.7 - 10.8 is fuck all more :huh: ?
