Solid Roller vs. Hyd. Roller - Pros/Cons?

[Dimis]

Boys, boys, boys... Plenty enough room in the sandbox for all of us.

Out right figures are not important to me.
Either Lippys or Rodknock engine can be made to spit out different numbers by messing with cams, and peaking the figures to suit.

RK raises a valid point. Thank you for posting.

I wont be using anywhere near 600hp anyway so why spend the dollars to push to 650hp?

BUT RK I'll put it in terms you may relate to... and I welcome your thoughts on this comparison.

What I'm wresting with is: If I buy the 911 carrera, It's a great car and I'll have plenty of fun, and if I didn't know the 911 carrera S existed I'd be happy and have no second thoughts. But Since I know the "S" exists I'm wondering if its worth the little extra cash?

I don't know anyone who wishes they had buying the 911 Carrera over the "S", but I personally know someone who wishes he had bought the S after buying the 911 Carrera.

In the big scheme of things it ain't worth fighting over, but not being able to have them side by side for comparison, I come seeking expertise from generous members of this forum.

[blykins]

I wanted to say a few more things about dyno numbers.

I'm in no way insinuating that guys doctor their numbers. What I am saying is that different brands of dynos yield different results. Period.

I've seen engines from a lot of well-known builders and I can attest that numbers vary. Greatly.

I wasn't cutting your engine combination Rod. What I was trying to say was, your engine, which is the typical 482 inch combo, with Edelbrock heads, Performer RPM intake, hydraulic roller, etc., just won't make 600 hp here. I have built numerous 482's just like that, even using cylinder heads and camshafts from other well-known builders. Again, not insinuating that people doctor numbers, but stating the fact that different dynos yield different results.

Does it make any logical sense that an engine with cylinder heads that flow almost 350 cfm on the intake side and over 260 cfm on the exhaust side, along with a camshaft that probably has over 20 degrees more duration, along with a ported single plane intake *only* makes 23 hp more than your combination? Really?

Also, if I were that worried about "selling numbers", I would go else-where to dyno my junk. But I would rather have a 400 hp engine that outruns all the 500 hp engines.

[RodKnock]

Originally Posted by Dimis

BUT RK I'll put it in terms you may relate to... and I welcome your thoughts on this comparison.

What I'm wresting with is: If I buy the 911 carrera, It's a great car and I'll have plenty of fun, and if I didn't know the 911 carrera S existed I'd be happy and have no second thoughts. But Since I know the "S" exists I'm wondering if its worth the little extra cash?

I don't know anyone who wishes they had buying the 911 Carrera over the "S", but I personally know someone who wishes he had bought the S after buying the 911 Carrera.

My first question is what generation of 911 would you be using in your analogy? Because, the early 911E long hoods (1969-1973) are considered better performers than their 911S counterparts. But, the early 911S is more valuable than the 911E.

If your friend is speaking of the modern 911S (called 991's), then I would say the performance difference is negligible and that if he or she wants MORE power, in real life terms, then buy a Turbo.

Personally, I would spend the extra cash on other things. Hydraulic rollers are less maintenance and cheaper. Can you make another 50-100 HP with a solid roller, sure, but they cost more, require more maintenance and as HP goes up, reliability goes down.