cb2280 great cam with hydros

[joop]

Update on: http://www.shoptalkforums.com/viewtopic ... 7&t=133837

The engine (DH) is done and mounted by my customers workshop. They did the 20min break-in procedure. The T3 has done now 1000KM and pulls really good (no top speed measurements yet)

Thanks Tencent for finding/testing a cam with better torque

[tencentlife]

Yup, it's got torque with a capital T. Great cam for the under 5500 rpm range of a typical wbx.

Nice that the hydros work so well on it, but actually I've tried hydros on some other "non-hydro" cams and they work just as well. Whatever it is that makes a hydro cam different, it doesn't seem to be required for them to work.

[pocketrocket]

On the other hand I have seen a few of the 2280 cams that the grind on the lobes was so bad that I won't use them anymore. I now take the time to set the cam up on vee blocks and run a dial ind. over each lobe to make sure it does not drop into any .007 valleys that I have found. Check it twice. Any drop off on the lobe will cause big problems. The engine will run so bad, we had that cam in a boxer block aircooled with dual Dcnfs that we could not adjust the idle. We took that cam (2280) out, installed a stock 2.1 made the engine run so good that we just left it in. The company that makes that cam 2280 had a batch of bad ones. Just an other thing to check. I have heard that if you take the hydros out, put in a solid lifters in engines will run fine, but you have to adjust the valves. Thanks Rocky

[AMBROSIA]

I've been running the more conservative cb 2252 for a few years now with no issues.
Recently I switched to 1.25 rockers.
The torque levels are fantastic

[hellllli]

Hm, sounds good to me

I'm thinking of getting one for my DG rebuild. Do you think the stock carburettor can cope with this cam or do I have to adjust it after putting everything together?

[tencentlife]

The 2280 will have quite a bit less vacuum at idle, like a reduction by 5-7"Hg. according to my measurements.

I echo Rocky's warning to mic out any new cam before using it, because production errors often make it out the manufacturer's door but once you run the thing, it's yours. We did see a run of bad CB cams, with base circle dropouts that will make hydro lifters impossible to run on that cam, solid lifters will run but may be noisy because clearance will be inconsistent around the base circle. CB remedied the problem but not before it cost me and Rocky both plenty of time and money. You'll often find cam timing errors as well, once you fit a gear on it the combo can be off a couple degrees either way. Doesn't matter who made the cam, these problems can be there and it's up to you to find them if they are. As they say, you are the engineer in charge, and errors that make their way all the way to the final build are your fault exclusively. Just because a part is new does not mean it's any good.

[hellllli]

For me it would be a bit of a problem, if the ordered cam is a "bad" one, since I'm here in Europe - the return could be a bit complicated

So, less vacuum at idle does mean less torque from idle on? Since I'm looking for more torque from idle on for my Syncro this would be the knock out criteria for the 2280.

Or I need to get an DJ EFI too

[pocketrocket]

Yes And that's why tencent and I are now using and new cam grinder, cams costs more but we can't use cams that are not perfect, And neither can anyone else. I will test (for a fee $25) and re-ship any cam that is sent to me for testing. I also have the new proprietary cam for sale they are checked and cost $200 ea. Thanks Rocky

[51MAN]

Where are you Helllli??

I have a 1.9 syncro also.. and am fitting a 2.1 DJ spec engine under the std carb etc.. (it works well in my 2wd Caravelle) but I am also slowly (yeas, I know, very slowly) building a 2.1 with DJ pistons and then either the 2280 or 2252 cam.. the stock carb will be used initially, but I will fit something a bit bigger to get more throttle area.. the goal is good off idle grunt... but that doesnt mind sitting at 4k on the motorway..

As been suggested, the variance with cam supplies worries me over here too.. better to buy a cam from a reliable source (I was going to ask if Rocky or Chris could do a check on them before shipping) Would it be worth discussing a group purchase and shipping? for us Europeans? (I live in the Uk but travel about Europe a bit, currently in the Netherlands)

I really must get this rolling now.. financially the last 3 years has been a bit of an arse, but things are better and improving now.. Just dont have the time.. I am working on that though... LOL

Of course, if I will the lotto tonight I shall pop over and order an engine or 2 in person...

[Paul Lee]

Hey joop. I'm really curious about what else you did to the DH besides the new cam. Any news on top speed yet?

[joop]

Hey joop. I'm really curious about what else you did to the DH besides the new cam. Any news on top speed yet?

A little porting and shorter intake guides dj intake and an empty catalitic converter.

Top speed is not good now... the owner did convert the car to LPG with one 30mm lpg venturie He asked me to convert it to a programmable lpg injection system. Wich I promised to do.... but I'm very busy now...
I've driven it without lpg (and lpg venturie) but I didn't want to go fast because his tires were not round

[Paul Lee]

Why shorter intake guides? Sorry if it's a silly question but I've been kicking around the idea of rebuilding my 1.9 DH in a 2.1 MV case. Maybe with a new cam, mine is kind of worn. Very few DJ's here in the states so those parts are probably out of my reach but I'd be curious to know how the intake is different? Thanks.

[joop]

Paul Lee, The owner rang me up yesterday to ask about the lpg injection installation while driving in his highroofcamper. I asked him to go test top speed He managed 140 Km/h with the 30mm venturie and on lpg. Before the lpg conversion it was 150+ Km/h. He travels 1000 Km every week (15000 km now on the fresh rebuild) He is going to Greece in a few weeks (holland greece holland is @ 8000 Km) His DH heads had long valve guides (15mm longer IIRC) I renewd the guides in the heads he has now for the shorter DJ ones. Also opend the ports to DJ specs and mounted DJ inlet tubes... no big changes

Joop

[Paul Lee]

Hey joop. I'm guessing that your customer gets an advantage from running lpg, probably fuel economy/cost. I'll have to do some searching and reading to figure out what's up with the different guides. I should have asked earlier but is this engine running the stock 69mm crank? Thanks again for all the info.

Paul

[joop]

1 US gallon is 9,60 USD here in holland (unleaded 95). LPG is almost 1/3 of that price

You don't have to do the searching about the intake guides... they are the same. Just the (previous) rebuild heads I had laying around had longer guides

Yes stock 69 crank

Joop