You are seriously one strange person. I said rockers increase duration, you said an increase in duration would help performance but "how do you increase duration by changing rocker ratios?" It would seem fairly obvious that you were asking me to explain it because you didn't understand it. But now you're playing it off like you were quizzing me? Wouldn't it seem that seeing as I brought it up I would at least know about it? Do you somehow think I just typed words that came to my head and by pure coincidence they came out like that?

You're a very tough person to have a conversation with. Feel free to email me though, if you're interested in learning about rockers and cams I'd be more than happy to share info with you.

Hi All

DrJay,



Since none of us know the answer, would you please explain it for us?


Having a little problem working in front of an audience? There are more than a few here with the same grasp of the basics as I have. We would all like the benefit of your knowledge.

In the first line of your first post, you made a statement. A question was asked about that statement, and you still have not answered it.


Please answer the question. If you cannot, please say so.

Regards, Norm

EDIT: The pun was intended

Hi all,

DrJay,


Right after we finish here.


Actually, I learned quite a bit at http://www.yellaterra.com.au/index.php

Regards, Norm

Hi abbike18, All,


I thought the rocker salesman would have answered you by now.

I believe they are 1.6, but DrJay says I have no experience with 3800 engines so you'll need a second opinion.

Regards, Norm

yep, 1.6:1 Rocker Arm Ratio

TOC Admin
Brando

Hi All,


Thanks.

Regards, Norm

Hi All,

For anyone that might still be following this thread.



It's obvious DrJay would rather evade, than answer the question.

Has anyone wondered why? I see four possible reasons:

1) He doesn't know the basics of valve train geometry.

2) He doesn't know the answer.

3) The statement is false.

4) All of the above.

Regards, Norm

hiya Norm!

I am wondering if DrJay just might be confusing a couple of things regarding higher ratio (numerically) rocker arms...

with camshaft duration and lift specs the same a high ratio rocker will accelerate the valve off the seat faster and close it faster though the ramp profile of the cam remains the same, if I am remembering correctly this increases the area "under the curve" which has a similar effect to increasing a cams duration...to a point.
valve lift (total)is increased at every point of the lobe profile but the valve opening faster and closing faster (one reason stiffer springs are recomended-to control valve bounce/float which would occur at a lower rpm than with stock rockers) is one of the reasons that a higher ratio rocker increases performance-more air+more fuel = more power.
most ECM's have a certain range of value's that it is adaptable so a lifter install will give you more power but for the best power computer/tunning modifications will be neccisary as with any internal combustion engine.

hope I have contributed my 2 cents....hehe

Oh we are TIGing the 10 point cage into the 442 this weekend as well as installing the two 5 point camlock G force racing harnesses (Al also got a helmet and one fer the wife-he says he's gonna make her give him a BJ with her wearing her helmet....lol )

So hopefully no tracks will have a problem with us running the car since we have way more safety equipment than is required....and amanda cant kill me if her hubby does sumthin stupid.....

Schlim

Hi Turbocharged400sbc, All

#4, all of the above is correct.

Schlim: Your comments are a welome change. I've been hoping your new situation would not keep you too busy to check in.


Correct.

Higher lift will contribute little or nothing without porting, and the area "under the curve" might make measureable gains. How much would depend, in part, on the flow characteristics of the head in question.

Shorter pushrods to correct the geometry change should also be included, along with springs, in the kit.


I believe you meant rocker install.

As I stated before, I believe the factory limits to be tighter than you describe in order to conform to emissions standards, but your statement is valid, regardless of what the tolerances might be.


In theory, yes. As I stated before, the actual gain is limited by the amount of air that actually enters the cylinder/combustion chamber in the specific application.


From what I read on his website and from all his posts, he has been quoting statements he read on the internet regarding series II engines, and he has little knowledge of the basics.

In the case of the series I, there are no published figures showing any gains from hi lift rockers only.

If there were, DrJay would have posted the link.

Has anyone wondered why manufacturers such as this one, are producing kits for the series II, but not for the series I?

Has anyone wondered why I keep posting this link?

Regards, Norm

yeah I screwed up I meant rocker....
yeah I have checked that link thoughly I have been in comunication with a gentlman in Australia (screen name locksmiff) Darryl who is the only other person I have found that is also working on a SII/SI hybrid with the SII cam and heads on the tall deck SI block....
Street commodore magazine has a forum (run search as I dont have a link handy...good guy so far we have been able to determin that it is doable but there still needs work as the pushrod angle seems to be offset a little (lifter bore spacing and locations are identical between the two blocks. the pushrods look like they do on the canted valve BBC heads it looks like the angle will be fine it would jkust be smart to get high quality pushrods when ordering the custom length.
I will keep in touch...
by the way we broke the rear window on the 442 just 30 minutes ago...we got 75% of the urethane cut and boom it shattered, but we have a new one as the orig was weld spattered, now we are starting to TIG the cage in....
James and AL

Hi Turbocharged400sbc, All,


Thanks for including paragraph three of DrJays first post.

Your answer was for all, while my answer was to one who was familiar with the subject.


It looks like DrJay is the only one that knows why I posted that particular link.


Always ready for updates on your engine work.

Regards, Norm

Hi All,

Statement #2


Or, maybe the product does not yet exist?


If they do exist, and are being used on DrJays engine, his dyno numbers would be a lot more useful than these, which I will deal with later.


Again, a smokescreen to make us believe series II specs are valid in a series I discussion.

My reference sources:
http://www.seriesoneperformance.com
http://www.yellaterra.com.au/index.php
and, of course, Rocker arms for 1991 3.8.

Regards, Norm

ROFL
















Please explain why DYNO gains on L36 motors are not a valid point of discussion.





Another thing, I try not to endorse any online vendor of automotive parts. Only reason I posted the link of the vendor's store was to indicate that there was an option out there for the orignal poster.

The price of the product in question is quite reasonable compared to what a similar product would cost for a very similar engine.









Go normy go go, go normy go go

HI All,



Different flow chacteristics.



It doesn't look that way, but we'll take your word for it.


The superior product would be worth the extra money, but it is is off topic because it will not fit the series I.


More smokescreen. Still no figures for a series I, because they do not exist.


The URL that was posted dealt with a blown engine only, which made it misleading to the point of being an outright lie.

My reference sources:
http://www.seriesoneperformance.com
http://www.yellaterra.com.au/index.php
and, of course, Rocker arms for a 1991 3.8

Regards, Norm

Please explain.