Jeep Strokers

So I'm going to rebuild my engine and there will be new valvesprings and a new camshaft,as I get it the valvesprings should be broken in at 1000-2000 steady rpm's up to full operational temp and then You should shut the engine of and let it cool down,but how do You do when breaking in a new camshaft requiers a totally different break in procedure?

I think I read somewhere that You can compress the valvesprings in a wise to take some tension out of them before installing them on the head,is that a possibility or is my memory pranking me as usual?

I don't have any other weaker springs to use that will accept the valvelift on the new camshaft so that is not an option as I see it,any suggestions from anybody?

Put it together with decent spring pressure and run it.

Your overthinking this or have to many friends.

Agreed. Use a zddp additive in the oil and let it rip. 2,500 revs for 20 min.

Yup I'm like that;overthinking is my midlle name,but I really like it to stay in one piece since it takes a lot of time and money to get stuff shipped to Sweden from the US.

Spring pressure will be OK according to a tech at Crane, installed pressure @ 100 ,open pressure just under 295 on the exhaust lobe,slightly less on the intake.spring rate is 335 lbs/in.,camshaft is a Lunati Vodoo 268/276 (lift : .527 in .548 ex)

Break in will be done with Joe Gibbs Break In oil, and after break in I will use Omega or Kendall Titanium sae 20/50 mineral oil,Kendall is good and has a decent price but Omega Oil is the really good stuff but the price is a bit on the expensive side...

Thanks for the replies guys,good to have a second opinion when not really sure myself.

/Hans

Don't worry about the spring break in procedure. Just perform the cam break in procedure.

str8-6 wrote:Yup I'm like that;overthinking is my midlle name,but I really like it to stay in one piece since it takes a lot of time and money to get stuff shipped to Sweden from the US.

Spring pressure will be OK according to a tech at Crane, installed pressure @ 100 ,open pressure just under 295 on the exhaust lobe,slightly less on the intake.spring rate is 335 lbs/in.,camshaft is a Lunati Vodoo 268/276 (lift : .527 in .548 ex)

Break in will be done with Joe Gibbs Break In oil, and after break in I will use Omega or Kendall Titanium sae 20/50 mineral oil,Kendall is good and has a decent price but Omega Oil is the really good stuff but the price is a bit on the expensive side...

Thanks for the replies guys,good to have a second opinion when not really sure myself.

/Hans

Crane tech is commenting on Lunati cams ?

Seat pressure is fine but the open pressures are a bit more then I would like to see.

Why 20w-50 ? 10w-30 is all you need or want. I see a not so happy cam/dist. gear

jsawduste wrote:Why 20w-50 ? 10w-30 is all you need or want. I see a not so happy cam/dist. gear

x2

Spring pressure advice from Crane or Comp Cams Tech, I would trust your friends here before them.

I think that you want a seat pressure about 90-100 pounds, and at max lift around 240-250 pounds, with a spring rate around 275 lb/in.
That seems to be about the average consensus around here.

Merry Christmas to You all!

Crane recommends above at least 260 for an engine that will rev above 4000 rpm,mine will probably rev around 6000...
20w/50 is the grade I used in this engine since 2009,no sign of wear on the dist.-gear at all,used that grade because the engine was built by worn out used parts laying around in the shop so it was a bit generous with some tolerances to say the least,been punishing the cr*p out of it since 2010 and it's still in one piece but now it's time to step it up a little bit ,decided that after loosing with 2 car-lenghts against a turbocharged BMW one night in late August.so more power natural aspirated and som 75 hp of nitrous on top of that