slydog 7,873 Posted October 7, 2013 I've wondered about biasing the porting to one side of the port to promote swirl - now i have to wonder no more. This is a great thread... Keep it up! Yes it has cleared a few things up hasn't it. 1 Clevo120Y reacted to this Share this post Link to post Share on other sites
Clevo120Y 815 Posted October 11, 2013 Hey guys, I've been flat out and haven't been on. The figures posted by flatchat are huge!!!! if they are at 28in like Tony mentioned, Those figures are top of the food chain stuff at 400hp potential, good stuff I would like to know more also. What we have to remember when throwing figures around is the context they are achieved, my port is a budget aimed setup, the head is pulled straight off an engine and has a worn but usable seat and stock standard valves, with just some time if you have the tools the results I posted can be achieved with minimal cash outlay. Tony's head has a little more invested in it and more thought into valve/bore ratio's ect ect and his results reflect that with the topend flow charge, not a massive amount of cash spent I wouldn't believe and he has thought about what needed doing for the purpose it's intended and got excellent results. Flatchat's head would be a top dollar no expense spared setup I would imagine and to be truthful I haven't seen a crossy head with higher flow figures, not saying it can't be done so don't think I'm doubting the results just saying that's the topend of results there and you should be very happy with that as long as the port size isn't too big for the rev range ect ect. I have no problem with people posting results of there work on here and if someone gets better results than me than more power to them I'm just happy to try some things and sharing the results, if others can have some input and share some insights that's even better and I look forward to seeing it. Gerg, I will do some Cleveland heads in the near future and post up the results, I have a set of open and closed 2V's on the shelf so I will do stock flow test's on both then show some porting work. Cleveland heads don't like a lot of material removed from the short turn but some blending and improving the radius of the short turn does work well, the heads seem to like having the roof raised but these things I will test to prove when I get to them, hopefully soon. I am yet to see a head that doesn't improve from general blending especially in the seat/throat/bowl area. When I port I start at the throat and blending into the seat then the bowl/valve guide areas then the short turn, so I'm work from the valve head back towards the manifold face. 2 Thom and ando76 reacted to this Share this post Link to post Share on other sites
Thom 6,686 Posted October 11, 2013 You need a stray clevo head to hi-port just to see the differece it makes, from what ive heard its supposed to be killer but what its worth on the flow bench would be an interesting comparrison 1 Clevo120Y reacted to this Share this post Link to post Share on other sites
ando76 4,354 Posted October 11, 2013 Good to see you back in the thread Clevo. Yeah my head has a lot of thought and maths in it, but not a great deal of dollars. Cam has found some further gains now that he has started on the actual head. I will post up the flow figures when it is done, with and without the inlet fitted. I didn't post the exhaust flow figures in the initial post but I will say that the inlet - exhaust percentages are down below 70% without the manifold fitted which is what we were aiming for, to allow for the reduction when the inlet manifold is fitted. I'll be interested to see what final flow figures you achieve when you get a decent seat cut and back cut on those valves. More power to you. 1 Clevo120Y reacted to this Share this post Link to post Share on other sites
Clevo120Y 815 Posted October 12, 2013 Yeah I'm still waiting on the head so I have started manifold v2.0, I will post some pics next week in the modified manifold thread of what I'm doing, a lot more work this time but hopefully the results will be worth it. I went and saw the bloke today and having a chat when he casually mentions that he has all the machining equipment for cylinder heads sitting in corner under a sheet so I'm going back there next week and start going through all of his equipment, then I just have to work out how to use it can't be that hard can it? LOL I should be able to turn myself into a backyard machinist/engineer with a bit of practise hahahahaha 1 Thom reacted to this Share this post Link to post Share on other sites
xdwagooon 46 Posted October 18, 2013 well ive got a couple of old 2v closed chamber heads youre welcome to abuse any time you want haha! just gotta get them down from rocko 1 Clevo120Y reacted to this Share this post Link to post Share on other sites
Clevo120Y 815 Posted October 18, 2013 Cheers mate, that's very nice of you. I'm not coming up to Perth any time soon but Tim is coming down here early November, I might see if he can pick them up for me if he isn't too far away. I will drop you a PM thanks Share this post Link to post Share on other sites
xdwagooon 46 Posted October 18, 2013 haha no worries ive got two sets so I don't think I need them both got ally heads on one and when I build the other id say thatll cop them aswell so otherwise theyre just door stops to me haha Share this post Link to post Share on other sites
P100_Ute 460 Posted October 18, 2013 This is something alot of people should take on board,always wear your PPE.You might feel like a dork wearing it at home when no-ones around but we all need to be thinking safety first.After a while you get use to it and it's benefits... I wear riggers gloves,safety glasses,ear muffs,long sleeves and long pants doing any welding cutting/grinding jobs. We have to wear all that stuff at work but at home.. Different ballgame. I still got 9 fingers, 90% hearing in 1 eye and can see perfectly out my of ear. well ive got a couple of old 2v closed chamber heads youre welcome to abuse any time you want haha! just gotta get them down from rocko Cheers mate, that's very nice of you. I'm not coming to Perth any time soon but Tim is coming down here early November, I might see if he can pick them up for me if he isn't too far away. I will drop you a PM thanks Im heading down to see Sean on Tuesday 5th Nov. im in Leda which is a stone throw away from Rocko. Will organise to pick them up for him before then. I fly home on 31st Oct at night so i can grab 1st - 4th sometime if that suits you? Share this post Link to post Share on other sites
xdwagooon 46 Posted October 18, 2013 haha I get home on the 23rd and taker back off on the 29th but can leave them at the olds or something for ya shouldn't be an issue Share this post Link to post Share on other sites
P100_Ute 460 Posted October 19, 2013 Or if u near leda between that time u could drop them at my place. ill make sure my womans home and can stick them in garage. msg me ur number and well talk on phone Share this post Link to post Share on other sites
Clevo120Y 815 Posted October 19, 2013 Look at you blokes go!! thanks for this guys another set of heads to port up and see how they go. Sending PM now Tim Share this post Link to post Share on other sites
xdwagooon 46 Posted October 19, 2013 hahah hey just remember this in time to come haha jk 1 Clevo120Y reacted to this Share this post Link to post Share on other sites
Lord_fahrquhar 2,581 Posted October 20, 2013 Serious question guys: Gloves on or off for grinding. I lean to no gloves, heard to many stories about gloved being caught in the machine and ripping big parts of skin off your arm. Share this post Link to post Share on other sites
slydog 7,873 Posted October 20, 2013 Never seen it happen or heard it infact...worked in fab shops for 10years always wear gloves even at home. Share this post Link to post Share on other sites
Thom 6,686 Posted October 20, 2013 I work on gloves for hand held machines like angle grinders/ welding/ die grinder and no gloves for things like bench grinders/ wire brush, drillpress/ lathe Share this post Link to post Share on other sites
matt_lamb_160 252 Posted October 20, 2013 Thom's advice is pretty good I think. Our OHS guys tell you no gloves for angle grinders but I just read SafeWork's (SA) guide for angle grinders and it says "Well-fitted gloves that allow a good grip of the tool". Gloves are a definite no no for bench grinders. Share this post Link to post Share on other sites
xdwagooon 46 Posted October 21, 2013 and don't use the real thin gloves with the grippy underside with drills or rattle guns haha/.... if they catch they grip really really well!!! Share this post Link to post Share on other sites
xdwagooon 46 Posted October 21, 2013 maybe we should start an ohs section Share this post Link to post Share on other sites
Lord_fahrquhar 2,581 Posted October 21, 2013 yeah why not Share this post Link to post Share on other sites
Clevo120Y 815 Posted November 1, 2013 Hey fellas, I was pulling down a 4L OHC head today and I thought I would chuck an intake valve in the crossflow port I did for this thread and run another flow test. The 4L valve is a 1.84in single angle job, so this test is with just the valve change and that is all. So just to recap. Test 1: stock C1A port and chamber with stock 1.8in valve Test 2: modified port, stock C1A chamber with stock 1.8in valve Test 3: modified port and chamber with stock 1.8in valve Test 4: same as test 3 but with 1.84in valve test1 test2 test3 test4 50 29.4 30.95 36.08 41.03 100 54 58.34 63.15 67.37 150 77.4 85.6 92.5 98.06 200 98.5 108.98 121.92 130.04 250 121.2 131.56 149.84 155.95 300 141.4 151.05 165.2 171.62 350 162.9 168.79 178.97 179.27 400 177.7 180.13 190.17 193.44 450 184.4 189.02 198.22 200.67 500 186.2 197.22 202.96 209.85 550 189.1 203 207.93 216.8 600 214.2 213.98 209.59 650 213.44 213.4 210.02 700 212.16 212.2 So the bigger valve shows good gains in the low and mid lift even compared to test 3, the port has a bit of a stall between 300 and 350 but recovers well after that. The biggest thing that changed was the sound of the port and the air velocity in the port also, the port became noticeably louder from 400 thou up, the velocity was skyrocketing also. My opinion of this is that now the small cross sectional area of the port is becoming a problem, remember that this port has the stock cross section, the port is now suffering from a sonic choke, this is when the airspeed is so high that it becomes turbulant and starts to actually flow less as the results show, when the lift goes over 550 the flow goes backwards and the port starts to scream. At 550 lift the airspeed in the smallest part of the port is reaching over 370 feet per second, I want it down to around 330 FPS at the max lift point which is 550 for this engine, sonic choke starts to become a factor from 340 FPS and up and this is now happening at around 400 lift. Now the silver lining, in my opinion what this is telling me is that the bigger valve is allowing the port to flow more air and that the short turn and bowl are still stable, that is why the flow is still increasing upto 550 lift even tho the airspeed in the minimal cross sectional area is over 370 FPS so by increasing the port diameter by a little I will be able to reduce the airspeed to an acceptable speed and increase flow at the same time. Looking at the results there has been some big gains from the stock port to were it's at now using the small cross section, I will start a new port to suit the bigger valve on Monday and let you guys know how it goes, I think I will develop this port more for a drag racing engine and show you guys the difference between the 2. 4 ando76, Mixalis, Thom and 1 other reacted to this Share this post Link to post Share on other sites
Thom 6,686 Posted November 1, 2013 Waiting in anticipation 1 Clevo120Y reacted to this Share this post Link to post Share on other sites
slydog 7,873 Posted November 1, 2013 Awesome results bro...seems you have a solid grip on things. 1 Clevo120Y reacted to this Share this post Link to post Share on other sites
PRO250 1,506 Posted November 1, 2013 still some mad work in here keep it up mate ive got my old head chart ill see if i can find it, somthing to compare to it worked ok that head bit the port runners where so big i think it was off a speedway car 1 Clevo120Y reacted to this Share this post Link to post Share on other sites
Clevo120Y 815 Posted November 1, 2013 Cheers guys, yeah Dave if you find it mate post it up I would like to see them for sure. Share this post Link to post Share on other sites
