This should be interesting. I want to open a discussion about peoples views and experiences on both hydraulic lifters and solid lifters in the VG30DETT. I am seriously considering using solids on my 2nd build engine mainly for stable valve operation at high rpm and high boost. So yeah post up your thoughts and experiences. J
what's there even to consider dude? ur using nitro (i mean ur serious about power) and ur gonna use GT2871R turbo's which means u want high rpm to get the flow up which means u need a lighter valve train the solid lifters gives u like an extra 1k rpm or 700rpm or something like that it's a no brainer if u have turbo's that big
Hydraulics have been proven fairly reliable up to 8krpm. After that, I wonder if the 60 degree V6 can really handle any more, reliably.
are you saying that a 60 degree v6 is not harmonically well balanced? because that is the ideal included angle for such a layout (ie v6)
I am using hydraulic lifters JUN 68 series hi-lift cams and a hybrid version of the 2871RS turbo. Not anticipating any problems and it will be nice and quiet (comparitively) for those times when I want to drive the bastard! If it was race only I probably would have gone solid and higher lift cams.
I'll put the details up in my project thread when they arrive IF they work out like we think they will
No, I know it's the ideal layout when compared with a 90 degree setup, however, a V6 has inherent harmonics that no matter how hard you try they will come back to bite you.
hey jase unless you intend to rev it alot more than the 7500 i wouldnt be going to solids. On the RB engines they rev em to 8k plus on hydraulic lifters.
Ha ha going for a solid 8500 to 9000rpm redline at this stage but have a lot more volumetric efficiency calcs to work on yet before anything is set in concrete. Its either this or stroke it out to around 3.6 - 3.8 litres to get the extra air needed to power the turbos.
Lifters Tomie make solids but hard to get and cheap part is the lifter, setting them up just right is costly as very time consuming to do it right, many many hours. Solids are better for high reving big power and seat better at higher rmp. The other factor and downside is they are noisy for road car.
I always thought valve chatter was more prominent when using solid lifters... and can cause increased wear on the valvetrain. In really high rpm the rotating movement causes chatter between the lifter and the camshaft.
wont stroking it hold back the revs a bit? id be looking at boring it but not stroking. In that case i would go for solid lifters. they wont be that noisy if set correctly so there is no real downside.
Have you actually measured the bores and clearances? How do you manage to calculate 3.6-3.8L? I wasnt confident I could get it to 3.5 with a stroker kit which is why I didnt go down that path. Your talking about doubling the amount of stroke I was looking at. Have you actually measured it out or just guessing?
Yeah, my first response to this post was going to be "actually manage to get your hands on some tomei solid lifters first, then consider the question". Can be a PITA to source.
Not necessarily as long as the bore stroke relationship stays the same, stock VG30dett is 87 bore and 83 stroke. So say a 89 bore and 85 stroke will be roughly the same however as you increase the piston diameter I believe you limit rev capability slightly A bit is guess and a bit is direct from Crower. They apparently have done a few 3.5 kits before but I do not know the exact specs. The Jun kit nets 3.2 litres over stock by increasing the bore from 87 to 89 and the stroke from 83 to 87mm. So if you go a 92 mm piston and a stroke of 90 or even 91mm it should get you pretty close to the 3.5 litre mark. For the 3.6 to 3.8 litre stroker it would put the bore/stroke relationship closer to square with a set of 94 mm pistons in sleeves and a 94 mm stroke it would be square and run pretty close to 3.8 litres capacity I think. The girdle would be a problem too I think at this extreme as would be block longevity etc. I havent done any checking on the build engine yet just figuring out the volumes etc at the moment and projected costs then I will see if it works out on the engine. Its very extreme though and will cost tens of thousands I am sure. I am leaning back towards the solid lifters and titanium valve train gear at this stage J
