80 replies to this topic

[2600s]

Hello, anyone there??

Ill start my own thread as I think some of you guys are too caught up in your own bullshit to be able to comment on what I have posted!

[2600s]

Correct Craig, maybe we need a thread for those who speak in degrees and duration.... :-0

Clives does seem the way I will go, just a nice lumpier one off the shelf than the standard 2600s cam, hopefully this will do the trick!

I have started a thread in this section about the rebuild, as things progress Ill post up some pics!

"Cheers"

Alf

[73TORANA!]

If you have got a near stock engine with a singal carb and your not after neck breaking performance why not go with the STD 72/73 XU1 Hydraulic grind ( spec 485 ) or wade 373 (same specs for both ) as mentioned near the start of this thread . I have the Wade version in my 73 GTR sounds realy good and have no troble in top gear down to 1500 rpm and it works from about 3000 to 5500 but of course you need all the other bits to take advantage of the top end ( heads /carbs and pipes).
You may end up with a little jerk but a lot can be removed with tuning . I had the same cam in a 186 and it was really good even in trafic its not to big and sounds good . if you want reel performance look else where this is a GMH factory spec cam . REMEMBER every thing has a trade off so don't be surprised if you loose some bottom end

I also have a friend that has put one of these cams in a dead stock 202 for a laugh and it runs surprisingly well , chirps into 2nd haha.

Just be carefull as with any engine mod ,MAKE SURE YOUR VALVE SPRINGS DON'T BIND and your clearances are good.

Hope this help , let me know if you want more info .

W A D E C A M S H A F T S P T Y L T D
A.B.N 62 004 544 996
27 Wells Road, Oakleigh, Vic, 3166
Phone (03)9568 0333 Fax (03) 9568 2633 Email [email protected]
Profile Actuation Make/Model R/Ratio
373 Flat Tappet Holden 6cyl 149-202 In1.5 Ex 1.5
--------------------------------------------------------------------------
Cam Lift Duration Duration Valve Valve Lift Phase
Adv @050 Clr Lift tdc <)
--------------------------------------------------------------------------
Intake 285 308 226 Hyd 0.4275 066 110.5
Exhaust 286 304 227 Hyd 0.429 052
--------------------------------------------------------------------------
Timing Timing
Adv @ 0.05
Open Close Open Close
Exhaust 88 36 46.5 0.5
Intake 46 82 6.5 40
82 7
Deg Over-lap Deg Over-lap
Intake Centreline 108
WARNING: Cam followers must have good surface finish and correct radius.
Lubricate well, avoid high RPM for the first 2 hours.
To avoid coil-binding, after the tappets are set, check that the valve-
spring can be compressed at least an extra .050" after full lift has
been achieved. This will stop the valve springs from binding.

[73TORANA!]

Thanks Kevin regarding the valves and springs.
Cheers

[2600s]

Thanks for the info!

"Cheers"

Alf

[2600s]

Thanks for the info stretchic!

[2600s]

I spoke to Clive on Friday, nice bloke and easy to speak to

I have decided on a 174 grind, this will suit the engine and will stop the car fom "Pig Rooting".
Very reasonably priced as well......

[DMLC71]

73 GTR,
With all the info on the 373 profile cam, what degree advances would you curve you dizzy to so it matches the cam?
I run the same cam from 373Wade cam and i am curious of the timing?
Thanks Daz

[73TORANA!]

Hi Daz, I sent all the cam and engine info to Performance Ignition in Nunawading ( Melb) and they set it up for me .
They ended up with 14 deg static and a total of 36 deg , had it dyno'ed and and the tune man said it was graphed properly .

Before it was graphed I had pinging problems and had to reduce the timing but this ment the static was set to about 8 deg with a total of 36 deg ( it was set up the way they did in the 70's ) I questioned why the static is now set to 14 and they said with the 98 ron fuel and the cam size it needs to have a higher static but the same total of 36. It did feel better .

On the dyno it turned out that 15 deg static gave the best results. Now it only pings if I don't use 98 ron.

Notes: cam timing set as spec sheet. 202 10.3:1 comp XU1 carb and manifold set up XU1 muffler and headers and a tuned up XU1 head she made 176hp at the boots with 266 ftlbs tq and with no oil in the carbs same hp and 286 ftlbs tq which is ok I spose for a near STD XU1 set up. the carb needles that are in it art the XU1 6D's as they are to rich down low but good up top so im' trying to work out a correct set up At present I use 6C's , fantastic for low and mid range but are too rich up top ( using an AFR meter ), these are what was in it at the time of the dyno . Carb needles ! another thread may be still working on a solution but hard to find needles.

Cheers.

[73TORANA!]

Hey 2600 out of interest can you post some spec's on the 174
Thanks.

[2600s]

Not sure on duration degrees or advertised, I am told begins working well from 2600rpm to 6500rpm.

[DMLC71]

Thanks 73 GTR.
I have a 186s with the 373 grind. I have had a commodore electronic dizzy curved to 16deg adv and timing set at 16deg. It runs really good. I have triple 150cds on a xu1 manifold, gtr headers, yella terra head hydraulic hi comp, anti pump up lifters, pistons 90thou flat top planed down on a lathe to suit 98 unleaded and never had any pinging noise. Pinging noise on a holden 6 sounds terrible.
Thanks for your timing info, it is always satisfying to compare.
Daz

[DMLC71]

73 GTR.
I had Wilson Carburettors fully re build and restore my XU1 150cds and they turned out unbelievable.
Try calling them about your running of your carbs. They have been in the game along time. 9330 0929
Daz

[73TORANA!]

Thanks Daz ,I have delt with them years ago ,I thought they had gone , I'll give them a buz . Cheers

[73TORANA!]

For what its worth here's my 50 cents . Big cams need a higher comp ratio but if its a street engine then 10.3 to 10.5 is a good all round ratio as its not to high for detination problems with premium fuels and won't strain the internals to much . For ciruit or strip you may want a bit more but fuels and componant stress need to be taken into account . I think the HQ boy's are up around the 11.5 mark
Personaly my settup is 10.3 and the head had 100 thou off from a previous engine (186 ) so I had to use ACL race series slugs with a 2cc dish to get (now a 202 60 thou up ) 10.3 and its fine on premium .

But don't forget to get your dissy graphed to suit the engine setup ,MOST IMPOTANT and well worth it .
hope this helps .