kickn5k Posted January 29, 2015 Report Share Posted January 29, 2015 (edited) Killer work mate!! Port work is definatly voodoo magic. Haha Ever played with any really obscure stuff? Stu. Edited January 29, 2015 by kickn5k Quote Link to comment Share on other sites More sharing options...
parrot Posted January 29, 2015 Report Share Posted January 29, 2015 With modern computerised milling machines etc, are modern cylinder heads much of an improvement such that such work is superfluous on say 2010 onward (as a random date) engine? Or are casting marks, port surfaces and port approaches as crappy as ever? Quote Link to comment Share on other sites More sharing options...
oldeskewltoy Posted January 30, 2015 Author Report Share Posted January 30, 2015 Killer work mate!! Port work is definatly voodoo magic. Haha Ever played with any really obscure stuff? Stu. Not too much obscure... mostly Toyota... 4KE, 4AGE, 5MGE, 7MGTE, and a little Nissan - SR20DE Still trying to get my hands on a 4U-GSE.... (FRS/GT86) Subaru's designation is the FA20 With modern computerised milling machines etc, are modern cylinder heads much of an improvement such that such work is superfluous on say 2010 onward (as a random date) engine? Or are casting marks, port surfaces and port approaches as crappy as ever? They are getting better... BUT as long as they are still mass produced parts, there will be flaws speaking about 4U-GSE/FA20.... Now back to the work @ hand...... Looks real good especially the short turns and the chambers. exhaust #1 all the chambers More to come........ :D Quote Link to comment Share on other sites More sharing options...
oldeskewltoy Posted February 10, 2015 Author Report Share Posted February 10, 2015 More to come........ :D After the cut' date=' with the valves fitted... waiting for checking chamber volumes.... [img']http://ost.ebeans.ch/albums/userpics/10005/head_back_after_cut_with_valves_smaller.jpg[/img] This head was cut .018" (.457mm) My caliper can't figure out if it is .45, or .46 "Volumes" to come........ :D Quote Link to comment Share on other sites More sharing options...
oldeskewltoy Posted February 12, 2015 Author Report Share Posted February 12, 2015 Since this head is coming here to Cali. Is the customer going to do any kind of camshaft or just use the stockers? I'd be curious I know that my web cams in my N/A engine wouldn't pass smog. Really? which Webs? My AE86 used the Web 294 grind and they passed' date=' albeit with a new OEM type cat, but they passed. And I'm pretty sure OST-019 passed using a mild cam, but it needed a bit of ignition timing tweaks to pass. Most likely my client will be running a set of the "big", or early stock cams if he can get himself a good pair. There is a Cat cam that MIGHT work, its their shortest, lowest lift cam, it measures 214 @ .040" lift, with a gross lift of 8 mm. The Web 294 cam is 214 also, but @ .050" lift. "Volumes" to come........ :D Checking chamber volumes on the cut head.... it is down to 35.1cc (tolerance = + or - .1cc) So we can move on... besides waiting a week for the machine work, that same time was used to get new springs.... 16 new OEM springs... Now its just left too assembly..... More to come..... :D Quote Link to comment Share on other sites More sharing options...
oldeskewltoy Posted February 15, 2015 Author Report Share Posted February 15, 2015 Amazing what isn't seen... A great deal... but its all there. From the top view you miss out on #1, and much of #3 but #2 and 4 are quite evident. Since this is a California head I've left the swirl generators, but managed to adjust their shapes to something a bit more uniform, one needs a bit more work - does anyone know wtf I'm talking about :lol: Did it get the super 5 angle valve job? 3 angle with back cut intakes California ? would those mod affect the ca emission drama on there ? They shouldn't....... Nothing I've done is actually drastic. For the most part I'm just improving the original casting by port matching the seats-bowls-ports to more closely match the original design. The surface machining of .018" is not beyond the normal range. A multi angle valve job is not beyond typical. The slightly raised compression will not hurt either. The client has selected to run a pair of MILD upgrade cams. He purchased 2 exhaust cams from Cat Cams 7105136 on my recommendation. They have the same timing as the OEM cams' date=' they have a bit more lift, and a bit more duration... without it going to an extreme (emissions unfriendly) What are swirl generators? I can see everything else you pointed out thanks. First apologies... the more common, and in this case correct term is actually "tumble generators" This kind of tumble generator promotes lower air speed performance by causing the incoming air to rotate as it approaches the valve. The theory is it helps to fill the valve area better. It also may act as a passive emissions device... to further aid in air-fuel mixing so more complete combustion can occur. More to come.... :D Quote Link to comment Share on other sites More sharing options...
oldeskewltoy Posted February 18, 2015 Author Report Share Posted February 18, 2015 Installing valve #8... apologies to AC/DC... my timing was off by about a second.... :lol: Quote Link to comment Share on other sites More sharing options...
oldeskewltoy Posted February 19, 2015 Author Report Share Posted February 19, 2015 The valvetrain is now assembled.... Cam caps buffed.... Just waiting on those new cams..... More to come...... :wave: Quote Link to comment Share on other sites More sharing options...
oldeskewltoy Posted March 3, 2015 Author Report Share Posted March 3, 2015 (edited) As I alluded too, the cams have arrived. They are a pair of Catcams 7105136 exhaust cams. As the box labels, and the cams indicate. Since I'm setting the valve clearances, and the cams are more or less identical, I've labelled them "I", "E" so there can't be any mixing of one to the other. This will also help my client get them back in the right places once the head is bolted on. These are a MILD bump in duration and lift over Bluetop cams. Just a reminder... early TVIS cams are 240 total duration, 204 duration@ 1mm lift, with 7.5mm cam lift. Ok, why go with such a "mild cam" a few reasons: 1) California emissions, that on its own can make or break this build. 2) My client is keeping the stock 9.4 to 1 pistons - he will be adding a thinner head gasket, and the chambers are smaller, but this engine won't be breaking past 10 to 1, so keeping as much trapped compression (DCR) is important. The ramp on this cam is pretty aggressive ("foot" is only 13 degrees) so even though the cam is "mild", it isn't as mild as the numbers appear... The intake timing @ 1mm lift for this exhaust cam used on the intake side would be 4ATDC to 36ABDC. Now add in the head cut to the cam timing (albeit not a huge amount) will move cam timing closer to 2ATDC and 34ABDC... all with 8mm lift and all the "extra" duration from 1/2 lift on. Only time will tell, but this should bring a nice LEGAL smile to my client :D More to come...... :D EDIT - not thinner headgasket, so only compression bump is from 1cc smaller chamber (about 9.6 to 1) Edited March 3, 2015 by oldeskewltoy Quote Link to comment Share on other sites More sharing options...
altezzaclub Posted March 3, 2015 Report Share Posted March 3, 2015 So difficult with emission laws there! There can't be enough old motors on the road nowdays to make any real difference, they should just dump the laws for cars over 10years old. Quote Link to comment Share on other sites More sharing options...
oldeskewltoy Posted March 5, 2015 Author Report Share Posted March 5, 2015 So difficult with emission laws there! There can't be enough old motors on the road nowdays to make any real difference, they should just dump the laws for cars over 10years old. It shouldn't be too difficult.... Keiichi Tsuchiya's 180hp 4AGE powered AE86 was reputed to use stock cams. The engine had been put together by legandary TRD tech Mr. Sakurai... There was a funny story when Tec-Art’s themselves were highly surprised when taking the 4A’s head apart as they were going to use it with the new block, to find that Sakurai-san has been using balanced OEM cams. He made roughly 180hp in the end with just stock cams and off the shelf TRD parts. He was admired as a highly skilled tuner. from this article.... http://www.farmofmin...legendary-ae86/ (180hp = 150-155 @ the wheels) I'm no TRD engine guru... but a stock 4AG is so detuned it approaches ridiculous. Make a near detonation proof chamber (piston crown is PART of the chamber), raise compression, improve flow in and out and its plausible for that kind of power...... Quote Link to comment Share on other sites More sharing options...
oldeskewltoy Posted March 5, 2015 Author Report Share Posted March 5, 2015 So last "quiz" on this head.... What's up? more to come..... :D Quote Link to comment Share on other sites More sharing options...
oldeskewltoy Posted March 6, 2015 Author Report Share Posted March 6, 2015 So last "quiz" on this head.... What's up? more to come..... :D Not even a guess?? (excluding altezzaclub, he's been playing....) Even a quick view @ the pic title gives MOST of it away.... "disassembled_exhaust_valves_for_tipping.jpg" How much easier can I make it??? :lol: alright.... what is seen above.... the intake cam is in, the exhaust cam is not only not in, but all the exhaust valves are out in box-stock type cardboard, each marked with two series of numbers (1-8), and a second series that appears to be measurements (apologies for not marking the type of units used). So the story.... The new cams were unpacked, and I began on the exhaust side. I used all 2.9mm shim to begin, and once the cam was tightened into place, and I checked... I managed to get 3 readings... all .0015" (spec on exhaust is .25mm, or .0100"), the other 5 were just too tight to even get a measurement. So, I removed the 5 shims, and fitted 5 of the thinnest shims I had, remeasured and found to get proper clearances I'd need to order 7 shims ranging from 2.5mm to 2.70mm. To make a LOOONG story much shorter... the second series of numbers that appear to be measurements are measurements of how much each of the exhaust valves need to be tipped. Tipping the valves will get their clearances back to a range were special ordered shims are not required(2.8-3.1). It will also allow for a 2nd valve job to be done on this head and still be able to shim it, something that would not be possible if I didn't tip the valves today. Now the good news... the intake side was set just fine, no weird things there. 5 valves are set @ .008" and the other 3 are @ .009" more to come.... :D Quote Link to comment Share on other sites More sharing options...
carbonboy Posted March 6, 2015 Report Share Posted March 6, 2015 I'll admit that despite having put one together, I don't know enough to immediately pick up on what you're up to. What I have seen that you've done, I like. I cheated when it came to my cylinder head rebuild, just handed it over to my local guru & let him do his thing. If I were US-based, I'd use you. Quote Link to comment Share on other sites More sharing options...
oldeskewltoy Posted March 7, 2015 Author Report Share Posted March 7, 2015 I'll admit that despite having put one together, I don't know enough to immediately pick up on what you're up to. What I have seen that you've done, I like. I cheated when it came to my cylinder head rebuild, just handed it over to my local guru & let him do his thing. If I were US-based, I'd use you. Thanks for the nice sentiment - I've sold ported heads all over the world... OST-008, and OST-013 each went to clients over seas - both in Europe. Right now I'm working on an SR20DE head for the purchaser of OST-008, he's now moved on to a Primera (G20) SR20DE powered, and I'm looking into ways to improve flow - http://www.sr20-foru...otainement.html But that's another thread.... Quote Link to comment Share on other sites More sharing options...
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