BENCH SEAT RACIN.com
VoyForums
[ Show ]
Support VoyForums
[ Shrink ]
VoyForums Announcement: Programming and providing support for this service has been a labor of love since 1997. We are one of the few services online who values our users' privacy, and have never sold your information. We have even fought hard to defend your privacy in legal cases; however, we've done it with almost no financial support -- paying out of pocket to continue providing the service. Due to the issues imposed on us by advertisers, we also stopped hosting most ads on the forums many years ago. We hope you appreciate our efforts.

Show your support by donating any amount. (Note: We are still technically a for-profit company, so your contribution is not tax-deductible.) PayPal Acct: Feedback:

Donate to VoyForums (PayPal):

Friday, April 19, 2:11:31 [ Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, 3, 4, 5, 6, [7], 8, 9, 10 ]

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Date Posted: 21:03:47 09/08/13 Sun
Author: Skip Meserve
Subject: Break in issues
In reply to: Dan 's message, "I just finished rebuilding and breaking in my sbc 350. During breaking the engine needed 55 deg timing at 2000 rpm to stay running, also kept my #5 and #6 header tube from glowing. At idle the timing was at 40 deg. At idle it was popping at the exhaust and would burn you eyes rich. The engine ran before this rebuild. I installed dart heads, hydraulic comp cam, air gap intake and a high pressure oil pump. 750 holley and MSD igniton. My cam degree in at 106 deg. Anybody have a idea where to start looking why my timing is so high?" on 00:28:19 09/07/13 Sat

Do not get too lost in all the timing issues. I do not understand the cam install at 106 degrees? that number usually indicates the split overlap center lines. If it is 0 degrees advanced at split overlap or "straight up" at 0 degrees tdc is should be ok. The distributor timing is the ignition event before top dead center as seen by the timing light at the balancer regardless of cam install timing. The first thing I would do is go over the valve adjustment to be sure none are too tight. I usually set them 1/4 turn after zero lash. I can not tell you how many times I have found valves too tight. The added compression should mean that you can run less timing due to the increased cylinder pressure. I trust you calculated the quench area when selecting the heads,pistons and head gaskets. Also see if you have a vacuum leak causing a lean condition in a couple of cyls while others are over rich trying to compensate with the carb adjustments. Keep us informed! Good Luck!

[ Next Thread | Previous Thread | Next Message | Previous Message ]
[ Contact Forum Admin ]

Forum timezone: GMT-5
VF Version: 3.00b, ConfDB:
Before posting please read our privacy policy.
VoyForums(tm) is a Free Service from Voyager Info-Systems.
Copyright © 1998-2019 Voyager Info-Systems. All Rights Reserved.