Date: Sun, 12 Aug 2001 07:01:00 -0500
Reply-To: Max Wellhouse <maxjoyce@IPA.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Max Wellhouse <maxjoyce@IPA.NET>
Subject: Boston Bob Engine update from south of Mason/Dixon
Content-Type: text/plain; charset="iso-8859-1"
This kind of information is very helpful to those of us that have purchased
engines from various vendors as well as to those contemplating future
purchases.
I bought one of the polished head/mild cam engines from Bob and eventually
got it running at a decent level, but that was more due to the fact that I
had installed an aftermarket FI system that was a PITA to get set up. It's
not perfect yet, but it's driveable and getting a little over 17mpg right
now, despite the Halmeter still reading rich through most of the load and
rpm ranges. Won't screw with it much more til I fix the exhaust leaks in the
Stebro J pipe and cat to Stebro muffler connections.
My experience with the B Bob motor has generally been positive as I approach
2000 miles on the rebuild. I am now running the Castol 20w50 oil which has
brought the oil pressure up to minimum standards at least. Although these
numbers really aren't any better than the numbers I was getting with my 160k
original with the same oil in it. I knew eventually that the rod bolts
would stretch out so better to fix while all is intact.
My low vaccum was likely not enough inital timing. it currently fluctuates
between 12-14 in. but idling at 700, I wouldn't expect any more than 10-12.
Jacking the idle up to 900-1000 should make the vaccum jump some. Tight
manifold/ throttle body/vaccum line connections should help it as well.
Whatever increase in low rpm torque I thought I was going to get hasn't
materialized yet but I can't fault the engine for that yet, as I have not
played with the accelerator pump program on the Haltech FI system yet. It
is extremely strong from 3000-5000 however, but then that could be the fuel
map settings I have at that range currently. Pulling power in 4th gear is
less than I'd like, but then I do have the Weddle 4.57 r/p and the .77 4th
gear. The motor pulls very strongly in 3rd up to a little over 60 mph.
After the better part of 5 months gettingthis thing on the road and
runningand then attempting to program the fuel and igniton maps, I think
I'll drive it a while and enjoy before making more changes.
My plans are to add the TWM twin throttle bodies to this engine when the
cash becomes available. Can't help thinking that single OEM throttle body
is holding this motor back some. Running .006 on the valves right now and
have 150 +/- 2 psi on all 4 cyl. Yes, this motor did run warmer while
breaking it in and has cooled off some since. The 100 air temps haven't
helped in that department either.
End o report.
Dimwitted Moose and Flying Squirrel