nismo.capri Posted August 25, 2008 Share Posted August 25, 2008 I'm getting through porting another 2L head. I still have work to do but it's coming along well. I need to do sort some better pics but here's things so far.... Here's the short story, before and after pics of the short side. It's hard trying to show the the how the sharp egde has been smoothed in to a curve Here's the std port The 2L is a good engine for it's day. If you are used to monden Jap ports the std 2L ports are just nasty. I started by shaping the valve guide After ruffing the guide boss in to shape I started on the throat Then it was on to the short side radius and getting the best curve out of it that I could Here's looking up the port I like to leave as much of the inlet untouched as it's too big to start with and the casting helps atomise any fuel that's dropped out. An easy way to see this effect is to put a drop of water on a piece of glass and blow at it then do the same using sand paper. The inlet isn't finished but it was close enough to get the valves cut and hit the flow bench. I also ruffed the exhaust in to shape but becasue of a sharp edge I manged to make it flow worse at high lift than the std exhaust. This is no biggie as smoothing it out will get it flowing. Here's the flow bench graph of the partial progress, I'm pleased as it's all were it should be what will tell the story will be the next Quote Link to comment Share on other sites More sharing options...
nismo.capri Posted August 25, 2008 Author Share Posted August 25, 2008 BTW Looking for flow data on the 2L if anyone has links or data I'd really appreciate it Quote Link to comment Share on other sites More sharing options...
peteretep Posted August 25, 2008 Share Posted August 25, 2008 you probably already know about them but try turbosport Quote Link to comment Share on other sites More sharing options...
eke_zetec_RWD Posted August 25, 2008 Share Posted August 25, 2008 vizzard book has alot of flow data. not sure if its compairable to your testing tho. whats happening with the pinto build off?? Quote Link to comment Share on other sites More sharing options...
nismo.capri Posted August 25, 2008 Author Share Posted August 25, 2008 you probably already know about them but try turbosport Thanks, Haven't tried them yet I'll have a look Quote Link to comment Share on other sites More sharing options...
nismo.capri Posted August 25, 2008 Author Share Posted August 25, 2008 vizzard book has alot of flow data. not sure if its compairable to your testing tho. His test's are at 25"H2O mine are at 28" whats happening with the pinto build off?? Nothing as we would have had to build the whole engine to really prove anything which would be ok for me but a bitch for vvega. Quote Link to comment Share on other sites More sharing options...
nismo.capri Posted August 25, 2008 Author Share Posted August 25, 2008 I got port flow analyzer to spit out my data at 25 inches of water so it's the same scale as Dave Vizards tests. Taking in to account that I still have some work to do I'm pleased with the results ...hopefully the work I'm planing to do will pick up the flow at high lift. I used Vizards "apple port" and Manly 44mm valve data. Lift Stock Nismo Vizard 0.100 51.0 49.8 54.0 0.200 91.0 105.9 106.5 0.300 119.5 141.4 147.0 0.400 136.5 157.9 167.5 0.500 146.0 167.1 178.0 (Vizard's data from Page 25 of how to modify Ford SOHC engines, fig 2-18) Quote Link to comment Share on other sites More sharing options...
d.p.n.s Posted August 25, 2008 Share Posted August 25, 2008 thats some nice work there mate turbosport.co.uk and oldskoolford.co.uk should be able to help you . dan Quote Link to comment Share on other sites More sharing options...
lowlancer Posted August 26, 2008 Share Posted August 26, 2008 Where's vvega, I'm scared Mean pics, throw some more up Quote Link to comment Share on other sites More sharing options...
CaMpylobacter Posted August 26, 2008 Share Posted August 26, 2008 lowld at vvega vs nismo race failing. looks choice bro. how many hours have you spent on this one? Quote Link to comment Share on other sites More sharing options...
cute wee gem Posted August 26, 2008 Share Posted August 26, 2008 awesome thread, old engines have some horrid castings marks eh! . I never knew how hard to go on the seat inserts, but it looks like you've taken shit loads off. Might have to give that a go Do you use the 6mm grinder all the time or do you have one of those micro ones aswell? and do you touch the valve guide at all or just do the boss then put new guides in? Quote Link to comment Share on other sites More sharing options...
nismo.capri Posted August 26, 2008 Author Share Posted August 26, 2008 Mean pics, throw some more up I'm getting there I'll try and get some more up tonight but I've got a busy night on. Gotta drop off a PC I fixed for a friend (Don't for get to scan for spyware weekly!) and I'm going to Excort's to see if we can nut out his ignition problems. Quote Link to comment Share on other sites More sharing options...
nismo.capri Posted August 26, 2008 Author Share Posted August 26, 2008 looks choice bro. how many hours have you spent on this one? Around 20ish I use a mini rotary tool so it can take some time chewing through cast. Quote Link to comment Share on other sites More sharing options...
nismo.capri Posted August 26, 2008 Author Share Posted August 26, 2008 awesome thread, old engines have some horrid castings marks eh! Yeah the scary thing is the pics are Sierra head which is a nicer than the older cortina/capri castings . I never knew how hard to go on the seat inserts, but it looks like you've taken shit loads off. Might have to give that a go With big valves I use the std valve seat as my guide and cut right back to it. Do you use the 6mm grinder all the time or do you have one of those micro ones aswell? I only have the mini rotary tool with the flexi extension. With decent cutters you'd be surprised at what it can move for it's size. and do you touch the valve guide at all or just do the boss then put new guides in? With the 2L the best flow is taking the guide right out to the port contour, the pisser is that the 2L have a short valve guide to start with and doing this really shortens the life of the guides. My guess is that the big reason why I haven't got the high lift flow comparied to Vizard is that my head still has all the valve guides, I'm still deciding if I should whack them or not... Quote Link to comment Share on other sites More sharing options...
esky 73 Posted August 27, 2008 Share Posted August 27, 2008 good to follow this thread, nice work on the ports, maybe i should just send my head to you! Quote Link to comment Share on other sites More sharing options...
eke_zetec_RWD Posted August 27, 2008 Share Posted August 27, 2008 i took the whole valve guide back to port shape. meh if it only lasts 20000km then who cares Quote Link to comment Share on other sites More sharing options...
nismo.capri Posted August 27, 2008 Author Share Posted August 27, 2008 good to follow this thread, nice work on the ports, maybe i should just send my head to you! Thanks! What would you go for with a ported head, modified guide bosses and less high lift flow or max flow and short life valve guides? Quote Link to comment Share on other sites More sharing options...
nismo.capri Posted August 27, 2008 Author Share Posted August 27, 2008 i took the whole valve guide back to port shape. meh if it only lasts 20000km then who cares I know what you mean but I might keep this head and since my van is a daily driver it might only last a year and a half... decisions decisions Quote Link to comment Share on other sites More sharing options...
nismo.capri Posted August 28, 2008 Author Share Posted August 28, 2008 Here's the exhaust. At the moment it's flowing worse at high lift than the stock head but I know that's becuse I haven't taken off the tight curve on the port wall. This is the stock port I start with the guide boss and work up the throat Looking up the port After opening it up a bit Quote Link to comment Share on other sites More sharing options...
esky 73 Posted August 29, 2008 Share Posted August 29, 2008 less life more flow for me, would it be a option or possible to use heavier inserts on the valve guides to give it some more life? good to follow this thread, nice work on the ports, maybe i should just send my head to you! Thanks! What would you go for with a ported head, modified guide bosses and less high lift flow or max flow and short life valve guides? Quote Link to comment Share on other sites More sharing options...
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