GT6boy Posted January 1, 2010 Author Share Posted January 1, 2010 Just a query: when people talk of the heads having a round or square edge- is this what they mean? These are extrusions on the edge of the heads. :-/ Link to comment Share on other sites More sharing options...
GT6boy Posted January 1, 2010 Author Share Posted January 1, 2010 So the plan will be to run these along to Maynards for them to cast an expert eye over them after cleaning, to assess which is the most viable as a donor for the car, in the role of mk3 'Go-faster' head. 1st job- assess likely skim required and do that 1st off all, before any other expense spent!!!!!! ;D 10.5/1 CR Unleaded conversion Gas flowed New guides CW or other valves I have 3 angle seats MBE for services to forum entertainment :-/? Link to comment Share on other sites More sharing options...
tiggrr1 Posted January 1, 2010 Share Posted January 1, 2010 Better luck this time Bruce,Hope to see you whizzing around the tracks soon :) Link to comment Share on other sites More sharing options...
Richard B Posted January 1, 2010 Share Posted January 1, 2010 Trouble is if you skim it first; that specifys the size of the combustion chambers for the CR.How about; modify chambers, skim, then flow the ports and cut valves if all ok? :-/ Link to comment Share on other sites More sharing options...
GT6boy Posted January 1, 2010 Author Share Posted January 1, 2010 Prelimenary skim- wont be a final one. One of the lesson's learn't (the expensive way) is not to leave all the skimming until after some of the expensive work has been achieved :B. Link to comment Share on other sites More sharing options...
Tim Bancroft Posted January 2, 2010 Share Posted January 2, 2010 Good luck, Bruce. Link to comment Share on other sites More sharing options...
Clive Posted January 2, 2010 Share Posted January 2, 2010 Fingers all crossed, but I am sure it will be 3rd time lucky :)One day we will see how yours compares with my spitfire at a trackday. Probably 2011 the way mines progressing, or rather not. Yours will be sorted PDQ now I expect! CLM?? Link to comment Share on other sites More sharing options...
JohnD Posted January 2, 2010 Share Posted January 2, 2010 Bruce,I hope this hasn't been discussed before, but have you considered measuring the thickness of the head face?Obviously, in a non-destructive way.Ultrasound is your answer - see: http://www.olympus-ims.com/en/25hp-plus/No idea how much this gadget is. Medical ultrasound imagers are in five figures of pounds, but this isn't an imager, just a thickness gauge -simpler, but more powerful. If your machine shop don't have one (and why should they?) they may be able to find someone who does, who will scan you head for a fee that might be less than re-doing a ruined head.JOhn Link to comment Share on other sites More sharing options...
GT6boy Posted January 3, 2010 Author Share Posted January 3, 2010 Classic Le Mans? Doubtful :B. Car will be ready, but CLM isn't factored into the years festivities.Fear not Clive, the automotive sap is indeed rising ;). Stoneleigh should be a go-er. Hoping for another cross-country blast like last year with the usual suspects 8).I'm off to Maynards to see them on Friday and go through my hopes and intentions in detail. I'm getting excited about cars again! i'm also going to try to get the head Ultrasonic examined at work. Not sure their devices will work in this application but, it wont cost anything but my time. Link to comment Share on other sites More sharing options...
Deleted User Posted January 3, 2010 Share Posted January 3, 2010 Bruce, why not try this years LaCarerra or its replacement? Its not expensive or too much strain on the car just a great event and some superb roads and fun. Link to comment Share on other sites More sharing options...
Royboy66 Posted January 3, 2010 Share Posted January 3, 2010 GT6boy wrote:. Stoneleigh should be a go-er. Hoping for another cross-country blast like last year with the usual suspects 8). 8) ;) Link to comment Share on other sites More sharing options...
GT6boy Posted January 8, 2010 Author Share Posted January 8, 2010 Dropped off the two heads at Maynards today. A fun filled time spent pouring over them with Mark and his 'new apprentice'. It really is an excellent set-up they have there 8). They will assess which of the two heads offers the best potential for my application. Much like a number of you here, their long term solution for my engine is: Deck block- ouch! fit the right cam :B Gasflow the head to match the new cam profile Work out which of my valves suits the plan However, that's for the longer term i'm afraid. The short term plan is to get a head fitted that gives at least 9.5/1 once its been gas flowed! I'll let you know how we get on. :) Link to comment Share on other sites More sharing options...
thescrapman Posted January 8, 2010 Share Posted January 8, 2010 If you have that much skimmed again off a head, when you deck the block are you not going to write that head off as it will give a CR of 15-odd???CheersColin Link to comment Share on other sites More sharing options...
GT6boy Posted January 8, 2010 Author Share Posted January 8, 2010 I may have painted an in-accurate picture of the long term plan :B. If we use for example the GT6 head(ta Nick!), this is already .007" under height, but as the combustion chamber hasn't had any material removed, the bare minimum will need to be removed to get at least 9.5/1 CR or probably somewhat better still. There does appear to be loads of metal left in both heads for skimming..... Realistically, I'll just as likely to have to accept less than 10.5/1 CR by this gas-flowing and skimming of this head alone- The final decking of the block will remove 2.5cc per cylinder, let alone allowing the pistons to 'pop-up'. But, all this is somewhat dependant on what there assessment of the heads potential is, which valves to fit (shrouding effects etc.) what the current combustion chamber volume is etc. Marvellous! :) Link to comment Share on other sites More sharing options...
GT6boy Posted February 11, 2010 Author Share Posted February 11, 2010 Picked up the 'new' head today. Crikey-Moses! 8) ;D 10.3/1, gas flow figures to make your bladder give way and to say i'm pleased is an understatement. Roy- keep your eye on your rear view mirror baby!!!! Mark Maynard (the machine shop owner) and Gareth Thomas have worked a bloomin' marvel here. You all know the last head broke the bank. These guys have lavished their time and energy and not billed me for at least 60% of the time and work done. The amount of time they've spent on the gasflow rig with this head and sorting out the inlet runners is mind-boggling :). Just look at the amount of metal GT had to remove from the inlet manifold to overcome a previously un-diagnosed airflow issue!! Burning the midnight oil is an apt expression, as both Mark and Gareth were working on these items until silly o'clock on more than a few ocassions. They knew my position financially, but still took on the work and effected a job way outside the actual money they charged me. Well done guys- I'm very grateful :). So we know what my job for tomorrow is! ;D Link to comment Share on other sites More sharing options...
Royboy66 Posted February 11, 2010 Share Posted February 11, 2010 Whoooosh, wtf !!? :'((clap)(cool) Link to comment Share on other sites More sharing options...
Clive Posted February 12, 2010 Share Posted February 12, 2010 In am HUGELY relieved that it has all come together. You needed a break!So, job for today....down to weigh in the ali that has been removed ;)then maybe a little fettling to the car? And hopefully when I get home tonight a report on the difference it all makes? should be significant! Link to comment Share on other sites More sharing options...
GT6boy Posted February 14, 2010 Author Share Posted February 14, 2010 Productive day today, around housework and the gym. Head down to 3.250", so all the tappets needed some tightening up somewhat. Loads of little jobs done with cable linkages and choke cable stuff, hose issues and trying to find the Kenlowe fan- where did I put that???? Bit more fiddlin' to do before start up tomorrow :). Link to comment Share on other sites More sharing options...
Deleted User Posted February 15, 2010 Share Posted February 15, 2010 Bruce, No photos of the head?Come on mate you know we want to see it.Rob Link to comment Share on other sites More sharing options...
Tim Bancroft Posted February 15, 2010 Share Posted February 15, 2010 Bruce,Watch that rocker geometry, check your pushrod lengths. I had to use shorter pushrods and shimmed the rocker pedestals, something the experts do not approve off. Link to comment Share on other sites More sharing options...
GT6boy Posted February 15, 2010 Author Share Posted February 15, 2010 Good point Tim- i'll have a look next time i'm out there. Meanwhile.... IT'S ALIVE!!!!!!!!!!!!!!!!!!!!!!!!!!!! ;D ;D ;D ;D ;D ;D ;D ;D ;D Details to follow after a bath! ;D Link to comment Share on other sites More sharing options...
GT6boy Posted February 15, 2010 Author Share Posted February 15, 2010 Finally found the Kenlowe in the garage- in a safety boot box( )Drained the old oil- it was less liquid engineering, more like a thick chocolate milkshake.Found the missing rocker shaft retaing screw- attached to the magnetic sump plug money well spent there.Fitted new oil filter.Tested the electrics- fuel pump wouldn't run. After a lot of investigation, it turns out the electric fuel pump pressure isolation switch failed. By-passed that using a spare 'white' wire from the ignition.Then time to start it.Turned over for some time, then a ker-fuffle of life, and just as the battery was getting saggy- VVVVVROOOOOM!So, obviously not tuned and the laptop not connected, meant 'choking' it more than i would have liked(it barely needed any choke in the past, but soon was hot enough to begin tuning.However, there was a marked tendancy to backfire from number 3 carb .At this stage, there was no manifold balance pipe fitted. After some high comedy moments with earth shattering backfires sending the temporary blanking manifold plug skywards .So, the perfect opportunity to try a contrast and compare with the new manifold balance pipe....A quick 'rough fit' with that seemed to remove the backfiring!Fitting the balance pipe in a more sealed and permanant manner embued the engine with a balanced and even tickover and no apparrent backfiring or fuel vapour evident at the carb throat!!!!!!!!So, good to see me and Roy's unguided tour of Lincolnshire bending the temperature gauge needle doesn't seem to have stripped the bearing shells of their linings- still got good oil pressure too.This was all done a bit late in the day today, so looking forward to a day fettlin' the state of tune and fitting some replacement hoses and bits and we should be looking good for a RR session prior to Stoneleigh. Link to comment Share on other sites More sharing options...
GT6boy Posted February 15, 2010 Author Share Posted February 15, 2010 bobyspit wrote:Bruce, No photos of the head?Come on mate you know we want to see it.Rob Hi Rob. The developments GT's made of late with port and chamber work are such that it would be inappropriate for me to put pictures on line. If Gareth wants to put them online- thats up to him. He spent hours and HOURS on the flow bench doing these, so it would be unfair to put that all in the public domain :). So excited!!!!!! Link to comment Share on other sites More sharing options...
tiggrr1 Posted February 15, 2010 Share Posted February 15, 2010 Go Brucie go 8) 8) 8)Nice to hear you all excited about the silver bullet again ;) Link to comment Share on other sites More sharing options...
Royboy66 Posted February 16, 2010 Share Posted February 16, 2010 (clap)(woot) Bye bye Steamboy!! Hello the Whooshster 8) ;)Im cleaning my rearview mirror already! (cool) Link to comment Share on other sites More sharing options...
.thumb.jpeg.b15b81ef10abeea1c3039ae03c4a9f3a.jpeg)
Recommended Posts
Archived
This topic is now archived and is closed to further replies.