Lifter issues with my ve ss ute

[CoCo1]

hey, i recently had a cam installed into my L98 (almost 6000km ago) and just last week i was diagnosed with a faulty lifter. I have a suspicion that it has happened due to the lift of the cam.
Duration Valve lift

Advertised @.050 - 1.7 Rocker Lobe step

IN EX In EX In EX Angle

279ᵒ 279ᵒ 227ᵒ 227ᵒ .598” .598” 112ᵒ

now im having them replace the lifters with new performance COMP CAM LIFTERS. at a cost of almost 2k.

if anyone could help that would be fantastic.

coco1

[CoCo1]

Should the cam package come with hp lifters?

[GenReaper]

If you dont mind ordering from the USA buy Morels lifter, they are the best and give you more oil pressure too.
Have much better roller pins, machined alloy bar stock housings, not cast, they are just heaps better.
If you have not bought the new ones yet i would use the above brand, if you can find them as they are hot propperty atm.

here is a set to give you an idea of them - Morel Lifters from Thunder Racing

I would also advise getting your valve seat pressure checked to make sure your spring are up to the job.
What are you running, 918 or 921 springs?

[WogBoyz]

are high ratio roller rockers the same as lifters? if so what about yella terra ones?

[GenReaper]

Hi ratio rockers just give more valve lift with the same cam lobe base circle.
You gain nothing using aftermarket rockers, they are actualy heavier than stock units and inertia is more than stock.
The only thing Roller rockers have going for them is roller tips on the valve stems.
I run standard rocker up to 7000rpm all the time no dramas with a cam that pushes 620 lift on the exhaust and 598ish on the inlet.
Its a big sucker tho, not a toy.

[WogBoyz]

Hi ratio rockers just give more valve lift with the same cam lobe base circle.
You gain nothing using aftermarket rockers, they are actualy heavier than stock units and inertia is more than stock.
The only thing Roller rockers have going for them is roller tips on the valve stems.
I run standard rocker up to 7000rpm all the time no dramas with a cam that pushes 620 lift on the exhaust and 598ish on the inlet.
Its a big sucker tho, not a toy.

ahhhh kk thanks for clearing that up mate

[CoCo1]

thanks heaps GenReaper,
i have emailed the company doing the work to my car suggesting MOREL lifters, and ill wait for their reply.
Im unsure if im using 918 or 921 springs however i do know they are PAC parts. i can find out though. which would be best? 918 or 921?

coco1

[GenReaper]

I run 921 because they are a double valve spring pretty sure 918's are a single.
My cam is pretty big and requires good springs but if would think you would get away with 918's.

It is always wise to check seat pressures on all springs, some times you can get a dodgey one tho not very often.
Personaly i would say you have just got a dodgey lifter but considering its done 6000kms i wonder.

Weak springs can cause the cam to jump off the top of the roller at max lift and not follow the profile of the cam hence cause lifter problems which it turn can chew up your cam as well.

Get the mechanic to check it out propperly and yep those Morel lifters are worth their weight it gold.

They may not even have heard of Morel lifters, but trust me when i say they are the bees knees.

[CoCo1]

you most definitely know your physics when it comes to the internals of a motor so i will be sure to trust your word. and i will be letting my mechanic know of the possible weak springs. if so it is their issue and not mine, and they can foot the bill under a warranty and negligence, for not doing a simple thing like checking the set pressures.

will there be signs of damage? they are pulled the heads off tomorrow morning.

[GenReaper]

With that many low Kms since install i doubt it.
If you got onto it quick which i believe you have it should be fine.
Any damage would be to the camshaft itself and you would need to pull it out to find out.
With the heads off you may be able to see it thru the lifter holes with a torch anyway, tho i doubt it will be damaged.
Quite frankly i would just slap a new set of quality lifters in it and check what springs it has and recheck all seat pressures.
Its worth paying the extra for quality lifters IMO, even if you have to wait for shipping to get here.
In saying that i am running comp lifters in mine but when they frag out i will be going Morels.
Big cams will generaly chew out average lifters in about 40,000 kms anyway.

[MICKY.D]

Hi ratio rockers just give more valve lift with the same cam lobe base circle.
You gain nothing using aftermarket rockers, they are actualy heavier than stock units and inertia is more than stock.
The only thing Roller rockers have going for them is roller tips on the valve stems.
I run standard rocker up to 7000rpm all the time no dramas with a cam that pushes 620 lift on the exhaust and 598ish on the inlet.
Its a big sucker tho, not a toy.

Just a note , i recently did our ultralite 1.85:1 ratio rockers on a customers L98, gained 11rwkw over stanard, no other changes , but just a note , not being picky.

Cheers
Mike-YT

[CoCo1]

Just a note , i recently did our ultralite 1.85:1 ratio rockers on a customers L98, gained 11rwkw over stanard, no other changes , but just a note , not being picky.

Cheers
Mike-YT

hey mike, just wondering how much those 1.85.1 ratio rockers are? ive done a bit of work to my car cam wise, so would i need something a bit different?

[CoCo1]

With that many low Kms since install i doubt it.
If you got onto it quick which i believe you have it should be fine.
Any damage would be to the camshaft itself and you would need to pull it out to find out.
With the heads off you may be able to see it thru the lifter holes with a torch anyway, tho i doubt it will be damaged.
Quite frankly i would just slap a new set of quality lifters in it and check what springs it has and recheck all seat pressures.
Its worth paying the extra for quality lifters IMO, even if you have to wait for shipping to get here.
In saying that i am running comp lifters in mine but when they frag out i will be going Morels.
Big cams will generaly chew out average lifters in about 40,000 kms anyway.

yeah i got onto it real quick the guys at JHP thought i was hearing stuff. they are checking my springs tomorrow and as they apparently just started on my car today. and they are going to try get me some morel lifters as they do talk up the brand. but also added comp cam lifters are prety much the same. uve been a massive help and i cant thank you enough.

josh

[GenReaper]

All good mate, your welcome.
Let us know how it pans out

PS : watch out putting higher ratio rockers on a large cam, cause it may have very little piston to valve clearance.

[CoCo1]

CAUTION & WARNING TO EVERYONE SEEKING A CAM UPGRADE!!
install lifters as well, if you can afford a CAM u can afford lifters. i wasnt informed of having to change them and now with a
damaged CAM, ####ed lifters and god knows what else, im up for well over 2k. CAM installed less then 4 months ago. and now this.

is this my issue of the companies that installed my CAM??

[WogBoyz]

Just a note , i recently did our ultralite 1.85:1 ratio rockers on a customers L98, gained 11rwkw over stanard, no other changes , but just a note , not being picky.

Cheers
Mike-YT

thats a good as result for standard, i wonder what kind of gains you could get with a full exhuast, mafless and a otr, should be pretty good id imagine

[CoCo1]

thats a good as result for standard, i wonder what kind of gains you could get with a full exhuast, mafless and a otr, should be pretty good id imagine

that is with xforce stainless 1 7/8 headers, xforce stainless 3" high flow cats, xforce stainless 3" exhaust. and the new VCM OTR with maf tune.

[CoCo1]

sorry just realised u commented on yella terra.

[WogBoyz]

sorry just realised u commented on yella terra.

haha yeah i was gunna say he said it was standard lol