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B20 roller rockers?

jens gustavsson

jens gustavsson

New member
Joined
Dec 1, 2004
Location
sweden/s?var
any one testing this roller rockers? from vintage performance?




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Roller Rocker Arms for Volvo B18/B20 engines - The New Kit Is Here and Easy to Install.

Since the decision to discontinue our old roller rocker kit we have been working on a new one. And now it's here. It uses the stock rocker shaft, shaft pedestals, adjusters and pushrods and will eventually be available in several ratios. Kits currently instock are 1.54 ratio, with rockers in 1.60 and 1.65 ratios projected to be available in 2012 . Installation is simple. Just unbolt the stock shaft, slide off the old rockers, remove the adusters and install them in the roller rockers, then install the roller rockers on the shaft. The only other modification necessary is to change to an aluminum valve cover to provide enough clearance for the end rockers. Introductory price good thru the end of 2011 - $325. With aluminum valve cover and gasket - $450. Both prices will go up by $25 for 2012



Advantages of the new Roller Rocker Kits for Volvo B18/B20 Engines will include:

Increases valve lift and effective duration.
Increases horsepower and torque.
Allows higher RPM operation.
Reduces valve train wear and increases the life of valve guides and seats.
Reduces heat by reducing friction.
Easier to install than other RR kits
Improved durability
Less expensive than other kits
 
These look like they are a direct replacement for the stock rockers, the KG one's are Pontiac rockers (I think?) and need a different shaft.

How hard should this be to make if you had access to a cnc machine ?
 
I'm sure they're a decent product, but John Parker (the guy behind Vintage Performance) has a long history of taking people's money and not delivering anything.

Killen k?nns j?vligt skumrask. Jag skulle undvika honom.
 
KG:s rockers are made by them but they only measure out to a 1.5:1 ratio.
Instead of 11.75mm valve lift they gave 12mm so I thought the difference was to small.
I hurt people that take my money without delivering. After that they always deliver.

Erland
 
Hmmm, let's see that valve cover. John hasn't been on this forum in a long time, I'd love a set, but have only had luck with customer support from European companies.
 
Erland Cox said:
KG:s rockers are made by them but they only measure out to a 1.5:1 ratio.
Instead of 11.75mm valve lift they gave 12mm so I thought the difference was to small.
I hurt people that take my money without delivering. After that they always deliver.

Erland
Click to expand...

I take to KG volvo trim today and a new 1.55 to 1.6 is on its way this sommer. quality made in sweden.
thay have busings to stock axels to now-days.
 
I have an older set of KG rockers in the PV's motor, along with the aluminum 'bridge' that repositions the rocker slightly and supports it full length.

IMG_4854.JPG


Using them with an R-sport head (late F casting, undrilled injector ports, part number stamped on right side, double valve springs, lots of porting work done, very large valves). And an Isky W81 cam, SBC lifters, tubular pushrods, short DCOE manifold, DCOE 40's, 4:1 header, 2.25" exhaust.

There is some gain from the increased leverage opening the valves a little more, and also (I think) a lessened bit of friction at higher RPM's when the rocker mashes the valve open - there's a little less friction at the valve tip?

I haven't swapped them back and forth that much, but a back-to-back compare wouldn't be hard with a dyno - maybe 10 minutes to swap things over and readjust. When I first got them (6 years ago?) I drove it, took the stock rockers off, put the rollers on, and drove it again. It's not a huge difference, there's just a little bit more power sprinkled about over most of the rev range. Maybe a little less at very low speeds (IIRC I had to open the carbs up some more to maintain idle rpm). I think it helps it rev higher.

Could be placebo affect too. Only real way to tell would be a back to back dyno. And apparently no dyno this year at SE (I'm planning on taking the PV down).
 
All that tuning is doing you very little good with the Weber 40:s.
Change them to DCO 50:s and you will see some real difference.

Erland
 
Yeah yeah yeah. The 40's cost $300 with manifold. They're a lot better than the SU's were. It's a beat up rusty old PV, I'm not going to sink srs bzns moniez into a set of 50's for it.
 
The difference between 45:s and 50:s is 20+ hp.
That is probably the difference between 40:s and 45:s also.
30+ hp for the prize of a set of carburetors is very cheap hp.

Erland
 
Roller Rockers

Hello to all, I'm newish to the forum and haven't had much to add until now but have certainly gained a lot from everyone's collective experiences. I have a P1800s which I have been tidying up as I have been enjoying driving it. Now though has come the time for an engine rebuild, I don't shy away from doing things properly so rightly or wrongly here is what I am doing:
- Late B20 engine with metric 8 bolt crank
- B21 92mm Mahle pistons. 10.5:1 comp ratio
- Balance rotating members
- Zero the deck
- Cylinder Head Valves: in 46 out 38.5
- Maximum porting and polishing intake and exhaust ducts. The combustion chambers are full and rounded.
- Dual valve springs with steel washers. Polished valves.
- Will run in on SU carbs and will stick with them for a while until I decide between twin 45 DCOE Webers or EFI with quad TBs.
- 4 into 1 R Sport headers to 2.5" exhaust, ceramic coated
- 123 Ignition
- CAM is a re profiled Street Performance cam, from a chap in the US who shall remain nameless. In reality the delivered camshaft was not what was sent.
- Isky rods and Chev lifters

And the reason for replying here: Roller Rockers, full custom set providing 1.65:1 ratio. This will give me valve lift of .509".
I have read many articles on roller rockers and have been confused by what has been available and then removed from sale or simply the number of kits provided that appeared to be compromise kits made from odd parts or perhaps I am misinformed.
The short motor is currently being machined as the head is finished )with many thanks to KG Trimning, in fact it is a work of art). As the engine progresses I will add photographs if anyone is interested. I will also report on the performance characteristics once complete.

The gearbox is another story that I shall save for another posting.

I would value any opinions and welcome any comments or recommendations.

Jayde (Australia)
 
So you're saying that you have a set of roller rockers? There was a set on eBay just last week - reworked from another application but with a ratio that was really high (like 1.7 or something). I passed on those. Still waiting for the "aftermarket" to address this particular item. As far as I know, no one has them for sale.
 
I haven't seen anything for sale for a while either, other than the same set on ebay. They are still there, oddly, but the 1.7 is a bit of a tall ratio.

RSI was talking about doing them a while back, never saw anything pan out, I heard rumors Knox was trying to get something going, never heard more on that, perhaps one of the swede companies has something available by now?
 
KGTrimning still has them on their website. That doesn't mean they can actually deliver a set. Unless this guy says otherwise.
 
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