Hey guys.. month or two Im going to be buying this:
http://www.golenengineservice.com/en...eep-long-block

I dont have the time or the know-how to properly build one myself and the 3 year unlimited mile warranty is nice. (Just had to get that out of the way haha)

My question is this... I know Roller Rockers can make a difference in larger more powerful engines as far as durability at higher RPMS and some people say they give you a little more HP (in this case probably only like 2-3) but do you think it is worth 400 extra dollars to get them installed in an I6? I would prefer to have the cash for intake/exhaust and the other stuff Ill need but if it would make it more durable, Im all for it. What do you think?

Thanks!

 

What does Golen have to say? I would ask them to see what their thoughts are. Maybe they can install them at a lower cost as they build the motor?

bpas328xi has harland sharp 1.6 roller rockers and he could probably better explain the benefits.

 

Yep. Ask Chad Golen. He's done a ton of dyno work on the strokers and has also given me great prices on any parts I've purchased from him.

 

Okay will do. Was not sure if he would shoot me straight or if he would try to sell. From what I have read he is a great guy but thought ide ask first. Thanks!

 

He's been nothing but straight with me.

 

Alright thanks man! Hey quick question. You have had strokers before correct? What options are out there besides a open cold air intake for getting enough cfm to the motor? My current system is rated at 500cfm and stock is like 375 i think. Im planning on going with a 68mm throttle body but no sure how I am going to get enough air to it without loosing the higher/ somewhat water proof intake. Spectre sells a larger sealed intake but I dont know if I can pull enough through the cowl. Any Ideas?

 

You'll have plenty of air with a 62mm throttle body. You gonna be revving it to 5,000 RPM regularly, and for sustained periods of time?

 

No I am not. Just reading on the jeepstrokers page the past few months and that was what some/most were running so I figured I'de go that way too. I guess I might be over thinking it... I just want it to run right if I am dumping the cash into it. I dont want it to be starved in any RPM range- though I wont be that high hardly ever if ever. Would you recommend going with a 62 instead? The price difference is negligible. Thank you for the help.

 

62 will be fine. My stroker is sitting on the stand with a 60mm Renix throttle body on it. I'm not worried at all. sizing the injectors is pretty easy and you should be good to go.

 

If I had the extra money I might do it, but for what you are doing, probably never notice it..

 

I did a little math after finding the formula (the formula to calculate 100% volumetric efficiency is-(Max RPM/2)*Displacement)/1728) which makes the stock xj 4.0 want around 366 CFM for 100%. A 60mm flows at about 377cfm (from what I can find online) and a 62 flows at 415 CFM at 100%. I guess Ill ask Golen what the displacement for that motor is and go from there. If it needs more than 450 (counting for dirty filter at times) I guess Ill go from there. Thank you for your help. Got my mind going to do the math myself haha

 

Most street engine will do at best 85% volume efficieny....

 

Gotcha. Just gotta find out what the displacement is on the motor so at least I have the capability of being in the correct range. In any case I think the ~500 with what I have (plus new TB) should be enough. Thanks again guys!