Tbi swap build thread - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rfmaster · 04-03-2009, 10:13 PM

Heated O2 control circuit.

Summit K1101 cam is a very mild mannered cam shaft. I have heard (never used one myself) that it (Summit K1101) works well with TBI. For a stock TBI EPROM idle vacuum must be around 16 to 18 inch at 600 RPM. Large overlap cams or narrow LSA kill idle vacuum for high RPM power. Since TBI relies on MAP sensor to determine volumetric efficiency significant deviation of vacuum at various operating points (RPM/MAP) will result in incorrect baseline fuel delivery. ECM can compensate, but if it is too far off - engine will run rather poorly if not at all.

You should be fine with this cam.....

//RF

04-03-2009, 10:13 PM	#11
rfmaster Registered User Join Date: Oct 2003 Location: OC CA Posts: 1,374	Re: Tbi swap build thread Heated O2 control circuit. Summit K1101 cam is a very mild mannered cam shaft. I have heard (never used one myself) that it (Summit K1101) works well with TBI. For a stock TBI EPROM idle vacuum must be around 16 to 18 inch at 600 RPM. Large overlap cams or narrow LSA kill idle vacuum for high RPM power. Since TBI relies on MAP sensor to determine volumetric efficiency significant deviation of vacuum at various operating points (RPM/MAP) will result in incorrect baseline fuel delivery. ECM can compensate, but if it is too far off - engine will run rather poorly if not at all. You should be fine with this cam..... //RF Attached Images __________________ "The Beast" 1975 Chevrolet C20 longbed 350/700R4! with 3inch body lift Dual Flowmasters Super 40's! TBI retrofit completed (2007-07-29) New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17)



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