Shorten exhaust cam.

You can use the 402 cams with std springs and retainers but I got their (Opel) springs which fit std retainers but are slightly thinner wire and slightly softer. You could use the nylon rope down the plug hole to remove the springs and retainers if you want to change them without pulling the heads but I would get the Web regrinds unless there is a big price difference.

 

Or switch to shim under

 

Or maybe the 9.3mm is only QV with its 33mm buckets vs the 37mm(?) in the 2v?
That would makes sense.......but I needed shim under I was told.

 

The 2V has 33mm buckets. The 402 cam wipes inside the shim and CAT says std buckets are fine. You can see the wipe pattern here:
https://www.ferrarichat.com/forum/threads/dereks-308-engine-rebuild.535247/page-12

 

I agree, that patter looks fine to me. Mine goes straight off the edges, but slightly different shaped lobes I guess, but you're looks fine and no doubt those came s will really wake it up.

Any piston clearance issues? I had to cut pretty big knotches but QV (&TR ) pistons were designed for pretty sad little cams compared to what was originally in a 2v

 

I'm pretty sure that grind requires WEB to weld up the lobes to get enough metal to grind. Went I hade mine done some years ago it was $50/lob to regrind, $100/lobe to weld and grind. I sent them billets that were round where the lobes go, they were $100/lobe too....x48

 

Nothing else is needed it sounds like....you can change more stuff and Derek did, but he says that is optional.

 

Yes, I would just swap the cams. If you have lots of time and patience you could change to the thinner springs which they sell, maybe fit titanium retainers to lighten the valve train, but Raf at Cat cams says the original springs work ok.They were $1490 excl. shipping when I last checked

 

My thoughts... And this is only because I do a lot of engineering on development engines. Off the shelf cat cams if the profile works good for the build.. The advantage of webcam is specifying any profile you want to match your build.

Cat cams option does allow for you to keep your factory cams if that matters.

 

Why can you just put the seal back in and run it?

 

14 years?....you bought the M800 about the same time I bought one right before I lost my mind and started the V12 didn't you? I thought I remembered your name but could quite place it.

the CAT cams grind is the most aggressive I would consider. I think the number will work well but I wouldn't go more and I'm trusting that the stock springs have the travel and pistons have the clearance as I don't know.

Web Cams has literally thousands of profiles they can grind. They did my V12 cams and send 5 options in the ranges I requested. What you see in the catalog is what they know what's well in a typical 2V engine.....but they will help custom match a grind when needed, but for your engine that is not needed. Either the Cat or catalog Web grind will be fine and work well

 

the 402 is an strong cam, concern would be coil bind on the inner spring.. from memory I recall the stock inner spring binds up right near 11mm. The 2V engines we do that have aggressive cams also use custom springs, etc...

anyone have experience with that cam and stock springs,etc..?

402 has a lot of overlap...

a common BIG web grind is the 159i/e for the stock valve train.
for comparison:

Intake: 0.360" / 9.144mm lift
Exhaust: 0.338" / 8.58mm lift
Duration @ 0.04" I/E 270*/263*
Duration @ 0.10" I/E 320*

really comes down the overall build and what you're after.

Dynomation is a great tool for putting together builds and seeing what various cam profiles will give you. I think it's about $500 for the program. Mark and I both use it, I also use a couple others that are crazy involved and make me question my sanity but that's another story.

As long as the profile works with the valve train, just about anything is better then stock. beyond that it's just optimization, not so much for peak power but the TQ curve. In mild builds I highly suggest trying to build more low/mid tq then peak HP, the stock gear ratios suck and short of screaming everywhere you go it doesn't make a lot of sense to go for pk HP numbers... i mean great you've squeezed 280HP at 8k RPM... but it's dead off idle and doesn't come on cam till 3.5k... never mind that the gear ratios for shifting are 6800..

hope that helps, probably made it worse.. sorry.

 

Reach out the the cam company. Derek said they advised him it was OK, but you can ask.

The other thing you can do is just measure it. Pull an intake cam, confirm the piston is DOWN, then put a dial indicator on the bucket and rig up something to push it down with and see how far it goes. You need the 10.75mm lift, minus lash, Plus 1.0mm clearance....so you want to see 11.55mm travel to use the Cat cam.

 

I would worry about piston clearance with the 402 grind. I suggest you talk to Raf at Cat cams and find out if they will work with whatever pistons you have. Also check if they can do other grinds. Web cams can do anything you want so could do a more modern version of the euro cams.
There’s also a lot to be said for just enjoying the car for a while— you deserve it and can always do this later

 

Went and dug up the specs in the WSM, inner spring has 11mm travel to bind, that's the delta between installed length and bind length. Outer spring is 11.5mm roughly. Really comes down to installed length... Measure is best.

Awfully close though...

 

Sorry 33mm shims