1.9:1 ratio rockers to suit Buick (non ecotec) V6's

[MACE]

Just though I'd give people a progress report on this product development.

Well they've been on my daily for quite some time now work quite well to say the least

Making the mid to top end much more usable, revving out to redline much more freely then before.

Hoping to organise some before and after runs over the next few weeks. Will keep all posted

Cheers
Steve

[crazybiker]

Roughly how much is the expected power increase for these? 5-8kw?

I suppose that a new tune will be needed aswell?

...and how much for these?

[MACE]

Roughly how much is the expected power increase for these? 5-8kw?

I suppose that a new tune will be needed aswell?

...and how much for these?

The expected power increase will be similar to that of the ecotec rockers of over 10kw at the rears.

No tune is required with this product.

The price will be around the $550 mark which will include pushrods.

They're also the lightest rocker for this engine on the market and will work on all non ecotec V6's (including series 1 VN's)

[immortality]

can't wait Steve. should go real well in the s1 with the extra lift they already have

[crazybiker]

I'm REALLY keen

But don't the 1.9's hit the rocker cover? Doesn't a larger rocker cover gasket need to be used to allow the use of 1.9's?

[nathanVY]

i'm keen, what else do you need to change to put these in?

[hakhawk]

so, do you specify what motor you have when getting these? since s1 vn use 3/8 rocker bolts, and s2 on use 5/16(or something to that effect, cant remember specific sizes or model change, but i know theres 2 different thread sizes on pre ecotec motors)

these are just modified ecotec rockers i assume(looking at their shape)? changed spacings to suit pre ecotec. good to see another option for pre ecotec motors!!

[MACE]

can't wait Steve. should go real well in the s1 with the extra lift they already have

It certainly does, as I have a S1 myself

I'm REALLY keen

But don't the 1.9's hit the rocker cover? Doesn't a larger rocker cover gasket need to be used to allow the use of 1.9's?

They don't hit the rocker covers, nor do they require spacers for them to be used as they comfortably sit under the factory rocker covers

i'm keen, what else do you need to change to put these in?

Everything needed comes in the kit

so, do you specify what motor you have when getting these? since s1 vn use 3/8 rocker bolts, and s2 on use 5/16(or something to that effect, cant remember specific sizes or model change, but i know theres 2 different thread sizes on pre ecotec motors)

these are just modified ecotec rockers i assume(looking at their shape)? changed spacings to suit pre ecotec. good to see another option for pre ecotec motors!!

That's correct hakhawk, all the customers need to do is specify what engine series they have and we'll send out the appropriate rockers to suit.

The rockers are based off LS1 rockers which are even lighter then the ecotec items

[nathanVY]

when can I order?

[MACE]

They should be be available in about a months time when we get some stock up, but will be worth the wait

[vc81]

The expected power increase will be similar to that of the ecotec rockers of over 10kw at the rears.

No tune is required with this product.

The price will be around the $550 mark which will include pushrods.

They're also the lightest rocker for this engine on the market and will work on all non ecotec V6's (including series 1 VN's)

Why do they need different pushrods? Thanks.

[peckzz]

i soooooooooooo cant wait, ima buy some within the week, got extractors, 2 1/2 exhaust and twin throttle bodys so this should set it off

[immortality]

i soooooooooooo cant wait, ima buy some within the week,

get in the line

[MACE]

Why do they need different pushrods? Thanks.

They need different push rods to correct the rocker geometry, in addition to giving extra clearance for higher ratios

[MACE]

As for the rockers we'll have these in stock in about a 3-4 weeks

Cheers
Steve

[dazadude]

Hi, just getting "inline" here for my order too...

Cheers Daza.

[nathanVY]

would you use these with/without cams? or either or?

[immortality]

you can use the 1.9's with a stock cam and heads as you are fairly close to max lift that the stock heads can hadle. if you modify the heads to handle extra lift then you can use these with a cam.

see post below for some numbers with regards to valve lift

[immortality]

i beleive the highlift cam + 1.8 rockers belief comes from the fact that when you combine high ratio rockers with a cam that has a lot of lift you run into problems with the valve stem seals. machining valve guides and using the corect springs/retainers (to prevent coil bind) would allow much greater valve lift

some numbers,

VNs1 6.909mm or 0.272" (lobe lift) x1.6 (rocker ratio)= .435" valve lift, x1.8 = .490" or x1.9 = .517" or with 2.25 = .612" valve lift

VNs2 6.43mm In. /6.48mm Ex. or .253"/.255" x1.6(rocker ratio) = .405"/.408" or x1.8 = .455"/.459" or x1.9 = .480"/.485" or x1.95 = .493"/.497" or x 1.98 = .501"/.505" or x2.25 = .569"/.573" valve lift.

VS 6.56mm/6.48mm or .258"/.255" In./Ex. x1.65 = .426"/.420 or x1.8 = .464"/.459 or x1.9 = .490"/.485" or x1.95 = .503"/.497 or x1.98 = .511"/.505" or x2.25 = .580"/.574" valve lift.

popular cam figures (so you can calculate your total valve lift with chosen rocker ratio),

wade 992a , .295" lobe lift
wade 1114a, .308" lobe lift

from what i've been told, you run into issues with stock heads at approx .520"- .540" valve lift (depending who you listen too ), so you can see that even with 1.8(buick) or 1.98 (ecotec) ratio rockers there is plenty more lift available before you run into any issues maybe Steve can confirm?

lobe lift values curtisy of gregories automotive manuals

here is a copy of a post from the V6 performance thread with regards to high ratio rockers (and the seed that started the journey to this product). hopefully this will answer a few questions people may have with regards to these rockers on the buick engines

for anybody with a s1 VN, you can see that with these 1.9:1 rockers on your engine you will have greater valve lift then the ecotec guys with 1.98:1 rockers as Steve has already mentioned, this gives the s1 engine the ability to breathe higher in the RPM band where these engines have previously been rather asthmatic and run out of steam before 5000rpm.

added benefits include the rocker fulcrum with roller bearing which reduces valve train friction and is good to help it rev harder and the parabolic tip used with these style of rockers greatly reduce valve guide wear that is evident with standard type rocker that tends to put a greater side load on the valve stem.

[Raptorsc]

Sweet thing hey, looking forward to the power tests on these, those S1s can do with something like this, especially for supercharging!

[nathanVY]

friggen sweet, so ill get these. and should I decide to get cams at a later date it will be compatible. just what I wanted to know thanks

[MACE]

You can use this with a cam however immortality has summed it up best

you can use the 1.9's with a stock cam and heads as you are fairly close to max lift that the stock heads can hadle. if you modify the heads to handle extra lift then you can use these with a cam.

see post below for some numbers with regards to valve lift

[vnmanual]

so this can all be done in an afternoons work without removal of the heads? any special tools required or new parts recommended while the rockers are off? doesn't need new valve springs?

regards

[MACE]

so this can all be done in an afternoons work without removal of the heads? any special tools required or new parts recommended while the rockers are off? doesn't need new valve springs?

regards

Hi vnmanual,

The installation can be done in under 2 hours, without the removal of cylinder heads of change of valve springs. The only special tool that would be required for the install would be a torque wrench

Cheers
Steve

[nathanVY]

so can we order them yet?