308 P6 cams

Do they have a part number stamped in the cam? They sound interesting.

 

measure them?

...there have been some threads about reworking 2V cams, try to find one for the name of the shop doing the grinding......

 

Webcam
www.webcamshafts.com
I think.

best
rt

 

Webcams has the machinery to measure them correctly. I am sure other companies have the correct machinery as well, but I know web cams has made Ferrari P6 cams in the past so they may know what to look for. As to what exactly a p6 cam is, I have no idea. I have heard so many different numbers I would not know what to quote. Somewhere around 309 duration (?) with around .374 lift. Anyone have any more solid numbers?

 

Not me, other than the legendary "Lemans race spec..."

They can make them up, from scratch????

 

They probably could make them from scratch, but it would be cheaper to regrind another set. I believe Norwood has a few blanks sitting around.

 

P6 cam PN marking and appearance posted by a fellow FChatter:
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Are any model delivered with P6 from the factory?

 

The P6 looks so much like a hot with high duration cam. Wonder what 's the lift are?

 

Search for 308GT4 Lemans specs, it also included pistons, correct.


I have the whole list but it was on here somewhere...the NART Chinetti entry

Great pics 91tr!

 

.....coordinate the lift with the pop up pistons!

 

No fishing, not to my knowledge but there are plenty of street cars of the time that did get the kit........I suppose as dealer or customer installed upgrade.

 

wow fantastic pics. that is one hot cam. I can't believe some people use that on the street. well, yes I can

 

Too bad those cams would make the car a complete stone on the street regardless of compression ratio. The 3.0 liter engine is just too small to take advantage of them south of 6000 rpm.

 

Not really. 21181 came to me with a set of P6 cams, 9.6 GT4LM Borgo pistons, with number 8 cylinder at zero compression, 0 leakdown, and number 7 about half way gone. Other 6 were equal. Car idled under 1000 and was not hard to get moving. Even with 1 1/2 cylinders gone I would put the performance above a 2 valve injected motor. If I get some time I want to try running them in my stock motor and see how they work.

As for identification, all four cams are marked P6, and should carry the following part numbers.

front exhaust 107191
front intake 107190

rear intake 107188
rear exhaust 107189

Ive never bothered to check trhe lift, Ithink its somewhere around 9mm?

Here is some info I collected on the GT4 LM which gives cam timing data...
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9.7:1 comp ratio isnt high enough to support that duration. Anyone who installs those cams will not say the street performance improved, peek HP will go up, torque will go down, its simple math because the dynamic compression ratio will be below 8:1. This means a neon will hammer the 308 even harder and the car will be less fun to drive. A 12:1 compression ratio and a complete overhaul of everything upstream and down stream of the valves is whats needed to make them work as designed.

 

Well, all I can say is the paperwork above is of the Michelotto Lemans engine. They built that motor, and they do seem to know what they are doing and have a good reputation. Obviously in that case 9.7:1 compression worked just fine with those camshafts. It certainly worked fine in mine with the EXACT same pistons. Even with only 6 1/2 cylinders. And even with two blown pistons I could have got away from a 2V injected car. I know of a euro glass dry sump car locally with P6 cams, and that car drives just fine as well. In addition, many V-12 Daytonas with the exact same 8.8:1 compression, the same identical stock 308 pistons, rods, and liners giving the same exact 365cc cylinder displacement, run the P6 profile with no troubles at all.

You guys are going to keep it up and I am just going to go throw them in this stock motor and see what it does, LOL. I'll throw it on a dyno first to get a baseline so we have something to measure against. Maybe I'll dig them out and measure the lift once and for all so we have a number.

 

longtime FChat tech readers will remember Philip Airey's P6 308 & his development and results -- as well as the performance camshaft thread. There are several interesting threads on this and the old board.

 

At the deaelrship I worked at we had a client who wanted more power from his early steel 308GTB, I happened to be going to the factory in the very near future and told him I would make enquires about the rumoured "Sports Pak" motore.

Carlo Levrini in spares (this was when Maranello had a retail / dealer parts counter) gave me all the part numbers for the cams, the exhaust system, carb jetting and distributors etc. When I asked about cam timing he called a man from engineering who met with me and gave me cam timing specs. All parts were available at that time (November 79) for what was a reasonable sounding $2000 - $2500. (keep in mind I recall GTB's in 79 were about $33K however...) I ordered a the parts for a "Sports Pak" engine then, and a subsequent set through Steve Lay at Maranello Concessionaires in the early 80's.

In November 79 the factory also had at least one Sports Pak motore built up, I remember Levrini offering it to me with complete with Dyno sheets, but I forget the price.

I think Chinetti-Garthwaite may have brought a couple of these motors and/or
parts kits in.

My recollections of the driving the car once modified was less low-end torque, but decidely "brighter" mid and upper range performance...our client was happy. I do not think however the preformance was all that different from an early Euro 308 GTB....Idle and low-speed drivability were OK, he used his car as a quasi daily-driver in the city.

I did try to acquire the bits to build another Sporks Pak motor from Maranello in 83 or 84, but the factory no longer stocked the bits. I was refered to "Little Tony" across the Via Abetone.

Forgive me if this is long and personal...this thread brought back happy memories! Maranello used to be a very "user friendly" place and willing to assist.

Cheers!

 

only 9.7:1 compression? I thought those things would have to have at least 10.5:1 or 11 to take advantage of the duration. They know what they are doing better than me, so I am going to leave it at that.

 

Remember that race engine with the lower compression was running full out, torque wasnt a requirement, RPM was. The 308 engine is a stone and only minor gains can be made while maintaining streetability. If someone wants to drop $3000+ in parts alone not to mention labour to gain 15HP and throw away torque then knock yourself out. P6 cams arent magical but a blower is .

Art you must have the fastest 308 engine built (with 2 blown pistons) if it can smoke a healty injected one.

 

The dyno sheets on Carobu's sight show otherwise regarding p6 streetability. The dyno sheets show torque being at a reasonable rpm, and the peak bhp not being all that much higher than that of a stock motor.

 

here is they flywheel dyno sheet to a 308 dry sump with P6 cams, 10.5:1 compression, and stock ignition
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