[DeTomaso] Ignition truble

[Jørn C. Olsen]

Hi Dan, Mike and Jack!
Thanks for the feedback!
I will go to the speedshop tomorrow and order a new steel distributor gear!
The distributor was put back in today with a new (used) bronce gear so I 
will probably have the same problem again.  I ran the bronce gear when I had 
the steel roller cam from Madden Racing in the engine with no problem.  Last 
year I changed the camshaft to a roller cam from Comp Cams 
http://www.compcams.com/Cam_Specs/CamDetails.aspx?csid=866&sb=2 and got this 
problem.
Do you know the shaft diameter on the MSD Pro Billet distributor with p.nr. 
8577 (forgot to messure it)? ............ or does someone know the part 
number on the steel gear that i shuld order?

J.C.


----- Original Message ----- 
From: "Daniel C Jones" <daniel.c.jones2 at gmail.com>
To: <detomaso at realbig.com>
Sent: Thursday, July 17, 2008 11:39 PM
Subject: Re: [DeTomaso] Ignition truble


>> FWIW Joern, Ford/SVO now sells a steel distributor drive gear for 351Ws 
>> that
>> I think will fit your roller cam Fontana. They also offer a polymer drive
>> gear for steel cams.
>
> The Fontana block takes a 351C cam so a 351C distributor gear is required,
> not a 351W.  FRPP and Crane offer steel gears for the 351C/351M/400 (same
> as the 429/460).  The FRPP gear is P/N M-12390-J (1.421" OD, 0.531" ID,
> for 351C) in the FRPP catalog.  From page 105 of the 2005 FRPP catalog:
>
> "Steel gears are compatible with billet steel camshafts (hydraulic roller
> type)".  Comp Cams also claims the Ford gears are compatible with their
> -8 austempered ductile iron hydraulic roller cam cores (Comp also uses
> the -8 cores for some solid street roller cams but uses steel cam cores
> for race solid rollers).  According to MSD, the Ford mild steel 
> distributor
> gears (as fitted to engines with factory hydraulic-roller-cams) are softer
> than the common ductile iron gears, but harder than bronze.  MSD also
> claims that Chevy uses a harder cam core for it's factory hydraulic 
> rollers
> and uses cast iron gears but that its gears don't last as long as the Ford
> gears. Ford doesn not recommend the gear be used on billet steel solid
> roller cams but some 5.0L racers have used the Ford gear on steel cam
> cores without incident.
>
> Crane has a coated steel gear which they claim is compatible with 
> induction
> hardened or carburized steel roller cores, as well as iron flat tappet 
> cores.
> Their website refers to them as "specially coated and processed steel
> distributor gears using either cast flat faced lifter or steel roller
> camshafts".  They list two part numbers for 351C distributors:
>
> 52970-1 Ford V-8 70-82, Boss 351-351C-351M-400 for 0.500" shaft diameter
> 52971-1 Ford V-8 70-82, Boss 351-351C-351M-400 for 0.531" shaft diameter
>
> Crane does not recommend the use of their gears on camshafts that have 
> been
> previously run with other types or materials of gears. Comp did not 
> recommend
> this gear on their -8 cores.  I'm told but have not verified that Crane's
> earliest steel gears were made like the Ford gears but their new gears are
> different.  We used this gear on a 408C recently with a steel cam 
> (hydraulic
> roller) from Crane and I ordered one for my 407 Fontana.
>
> Dan Jones
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