head work?

[playboy]

has anyone looked into the jesel roller rockers and followers? they are pretty pricey but i'm really considering them the followers are around 130 each and the lash adjusters are arond 35 each.. but i'm sure the gains are outstanding

[WopOnTour]

Originally Posted by playboy

has anyone looked into the jesel roller rockers and followers? they are pretty pricey but i'm really considering them the followers are around 130 each and the lash adjusters are arond 35 each.. but i'm sure the gains are outstanding

The Jessel valvetrain is pretty much used only for "solid" lifter racing cams with over .500" lift, huge bee-hive springs and "relieved" pistons. By themselves they offer very little if any "gains" at all, (AFAIK they are still the stock rocker ratio of 1.685:1) However getting into cams of these grinds generally require a serious "race only" engine not suitable for "daily driver" street operation . Keep in mind that as long as you are using a hydraulic cam the stock followers and hyd lash adjusters have been used in 600-1000HP engines without problems. (pretty much the same parts are used in the 2000+ Northstar engines as well)
HTH
WopOnTour

[playboy]

i personally don't see how it couldn't help but i'm not just going to go out and drop a grand on this either i just read about them and emailed them about it and they sent me the part numbers and prices.... i'm certainly not going to do anything without discussing it first!

[WopOnTour]

Originally Posted by playboy

i personally don't see how it couldn't help but i'm not just going to go out and drop a grand on this either i just read about them and emailed them about it and they sent me the part numbers and prices.... i'm certainly not going to do anything without discussing it first!

Understood. Sorry, not trying to beat down your ideas or anything, just posting my impressions on the necessity of this equipment given a daily driven Redline, tempered by my own personal experience. (Which certainly and admittedly isn’t always 100% technically correct- I've ate my fair share of crow through the years LOL)

The Jessel valvetrain would certainly reduce a certain amount of friction/wear on the valve tip, but how this could directly equate to any significant horsepower is questionable IMHO. This is the kind of "supporting cast" componentry that indirectly ALLOWS you to make more horsepower in conjunction with other parts. As I said this valvetrain is targeting very high lift cams by eliminating the hydraulic lash adjuster, and therefore can eliminate any hydraulic effects that can affect valve timing accuracy or introduce valve float at high RPM. This would also mean you would be able to adjust your valve:rocker clearances manually (and hence net lift/duration as well) using shims to fine tune your powerband (especially in combination with adjustable timing gears)

Conventional wisdom would be "not on a daily driver", but I've run LOTS of solid lifter cams on the street, however only in SB and BB V8s. So I'm more than just a little curious just how "streetable" the ECOTEC would be runnin a huge "bumpstick". On a "speed density" engines it's usually an issue at idle and light loads, due to the drop in manifold pressure being equated by a MAP sensor as engine load. BUT the LSJ uses a mass airflow sensor (MAF) as its primary input for "loaded" fueling so maybe it wouldn’t be that bad?? Hmmm

ANYONE HERE SPORTIN A MASSIVE CAM??
WopOnTour

[ArrivalBlueSS]

Check out the valve system on the Ducati engines. The valve is mechanically opened and closed (instead of using a spring to close it). It's a pretty tight system but you need to adjust your valve clearance every 6000 miles.

Would a valvetrain like that only matter if you planned to take your car up to higher RPMs, ect?

[Sp00ner]

This is one of those things that people should buy when the turn their cars into monsters, but most forgoe it to buy more power. From the sound of it....

Kinda like dropping a stud girdle into a stock small block and expecting more power from it.

BTW... My cam is huge...

[WopOnTour]

Originally Posted by Sp00ner

Kinda like dropping a stud girdle into a stock small block and expecting more power from it.

Exactly! (on the stud girdle analogy)

Originally Posted by Sp00ner

BTW... My cam is huge...

LOL - that's what they ALL say!!

[WopOnTour]

Originally Posted by ArrivalBlueSS

Check out the valve system on the Ducati engines. The valve is mechanically opened and closed (instead of using a spring to close it). It's a pretty tight system but you need to adjust your valve clearance every 6000 miles.Would a valvetrain like that only matter if you planned to take your car up to higher RPMs, ect?

Exactly. High RPM is WHEN mechanically closing the valve starts to become an advantage. It's all about TIME.

At lower RPM you springs have all the time in the world to close your exhaust valve prior to the next intake stroke- but as RPM increases, the available time diminishes- thus there will be a precise rpm where this will not occur i.e. "valve float". By increasing spring pressure you increase the RPM limit when float will occur. By mechanically linking valve open/close to the crankshaft stroke event (such as the Ducati, some Rolls, Ferrari, even old Briggs & Stratton- LOL) you are limited only by the ability to control the accuracy and durability of the "overworked" mechanical mechanism. (resulting in accelerated wear and additional regular maintenance - something anyone driving a Ducati probably cares less about!)
Clear as mud??
WopOnTour

[Sp00ner]

Which is sort of what soild lifters are trying to achieve, no? Eliminating the fluid in the lifters and such?

[playboy]

i'm just curious for other opinions here... this is a lot of money to drop into something like this and i'm no tjust going to do it at a drop of a dime especially for only 20 hp.... no way!