Todd
'88 Westy
Robert Donalds wrote:
Fellow vanagon types I have been building a 2.1 engine for my own 85 camper and along with the usual upgrades of the reground OEM cam with more duration, a little more piston skirt clearance and some major head work. I decided to try a set of larger valves and larger harder valve seats. After all the work to get larger valves and seats into a pair of AMC heads and doing the high flow valve job I sent the heads out to have them flow tested on a flow bench. The flow bench measures cubic feet of air moving threw each port at a given valve lift. Some of you might recall that I had some flow testing done when I started doing high flow valve jobs on stock heads with varying degrees of porting work. Flow bench test results1 stock AMC head intake port2 ported and polished AMC head stock valve intake port3 Boston Bobs big valve AMC head minor porting CFM.------------------------------------------------------------------- Lift NO.1intake NO.2 intake NO.3 intake.050 24.8 33.0 34.8.100 47.1 52.2 57.3.200 89.6 91.4 108.4.250 115.4 116.7 132.8.300 125.3 128.5 145.8.350 137.6 145.3 171.4.400 144.9 158.8 181.3 this is above stock lift but I thought it was of interest.450 147.8 174.1 186.0 to Robert Lilly.500 154.6 179.0 190.6 as you can see I am very pleased with the results.I am tempted but wont be using ratio rockersmaybe a chip if they have them for the 85 fuel injection system next yearno dyno testing will be done unless your payingno estimates of horse power wiil be offeredI am still installing the engine and will report on power when its sorted outat that point I will decide whether to offer the large valve heads on my rebuiltengines Bob Donaldshttp://www.bostonengine as always all rights reserved