My problem is that over long runs at 3000+ rpm in OD, I am getting some
pinging and overheating. Everything below 3000 is great. I want to avoid
advancing too much, but I am thinking that maybe I need to have my
distributor set up for hi-compression. I have high compression pistons
(arias) and my cam was suppose to be ground to BJ8 specs. From memory, my
timing is advancing to approx 30-35 degrees around 2000 RPM. I still have
the stock distributor and assume the same advance unit. I am running the
3.54 rear end with a 28% OD, so I am sure that it adds to the torque
requirements.
Per the email from Curt below, I would be interested in knowing the vacuum
settings (normally 5-12-8 for MKII) for the "High compression special
orders" vacuum units. IE, the start of advance, max advance, etc. If
anyone could relay that information I would certainly appreciate it.
Better yet, if you have a good one lying around for sale, email directly.
What do the racers do when they keep the stock distributor and have high
performance guts?
Regards,
Olin Brimberry
Raleigh, NC
62 BT7
Date: Sun, 16 Oct 2005 18:20:31 EDT
From: CNAArndt@aol.com
Subject: Re: Distributor Vacuum Units
Josef,
Off the top of my head ;) here is a short list through 1960.
BN1/2
1953-55 Early distributor 40320A - vacuum 420006
1955 Early 100M distributor 40422 - vacuum 420755
1956 Later distributor 40495A - vacuum 54411727
1956 Later 100M distributor 40520A - vacuum 54411233
BN4/6
1957 For distributor 40532A - the vacuum control unit is 54412033. I
believe
that this the one for the BN4.
1958-59 For distributor 40581A/B - the vacuum contol unit is 421189, which
should be for the BN6.
3000 Mk1
1959-60 distributor 40662A/D - vacuum 421189
AN5
1958-59 distributor 40561D/H - vacuum 54411100
1960 distributor 40561J vacuum 54411100
"High compression special orders."
1958-59 distributor 40656A/B & E - vacuum 425700
1960 distributor 40656D & F - vacuum 425700
Cheers,
Curt Arndt
Carlsbad, CA
'55 BN1, '60 AN5 :{) '72 RWA Midget
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