M_R_205 5 1 Cars Posted January 15, 2007 (edited) I bought an mi16 a while back which supposedly had a head as built buy David baker which came with a supposed 36.5mm inlets however on finally pulling the engine apart the valves dont quite measure 36.5mm my vernier measures 35.94mm, can I rest assured that I have not had my eyes conned out and that a 36.5 mm valve can be slightly smaller and they round it up? secondly can I prove it is one of his heads, its all well and good having the big valves but if some idiot has just crammed a flap wheel in for 20 mins and re cut the seats for the bigger valves I may as well have thrown my money away, and as im no expert on how a `good` throat should look I cant really tell if has been done by him or some clown!!! Edited January 15, 2007 by M_R_205 Share this post Link to post Share on other sites
PumaRacing 2 Posted January 15, 2007 My valves are 36.5mm exactly. This is not one of my heads. Share this post Link to post Share on other sites
M_R_205 5 1 Cars Posted January 15, 2007 My valves are 36.5mm exactly. This is not one of my heads. thats a real gutter, if i was to upload a couple of pics would you be able to give your opinion on it? Share this post Link to post Share on other sites
petert 585 Posted January 15, 2007 I wouldn't get too upset about 0.5mm. Getting the seat work correct is far more important. Share this post Link to post Share on other sites
M_R_205 5 1 Cars Posted January 15, 2007 I wouldn't get too upset about 0.5mm. Getting the seat work correct is far more important. i agree with you there, i just hope the head is decent and not a cowboy job, im gona up load sum pics when i get home from work let ppl give opinions on it... Share this post Link to post Share on other sites
smckeown 1 Posted January 15, 2007 as it's off why not get it flow tested by someone like QEP ? Share this post Link to post Share on other sites
M_R_205 5 1 Cars Posted January 15, 2007 as it's off why not get it flow tested by someone like QEP ? good plan! what sort of price is involved? however i have no idea what all the flow figures mean, ive seen the CFM figures in other threads but its meaningless to me.... Share this post Link to post Share on other sites
Sandy 191 Posted January 15, 2007 good plan! what sort of price is involved? however i have no idea what all the flow figures mean, ive seen the CFM figures in other threads but its meaningless to me.... I'd like to throw some cold water on the idea that flow makes a good head, if only it was that simple. Share this post Link to post Share on other sites
Rippthrough 98 Posted January 15, 2007 (edited) Flow figures are no good without port velocities, and even then it's not a comprehensive analysis. Arse dyno is the best way! Edited January 15, 2007 by Rippthrough Share this post Link to post Share on other sites
M_R_205 5 1 Cars Posted January 15, 2007 I'd like to throw some cold water on the idea that flow makes a good head, if only it was that simple. so what else makes a good head, i ask while not trying to sound stupid... Share this post Link to post Share on other sites
M_R_205 5 1 Cars Posted January 15, 2007 (edited) rite well I have taken some pics of the ports and valves so you can see whether or not you think they have bin done by some on good or someone s*it, all feed back welcome http://i91.photobucket.com/albums/k296/con...gh/IMG_0595.jpg http://i91.photobucket.com/albums/k296/con...gh/IMG_0589.jpg http://i91.photobucket.com/albums/k296/con...gh/IMG_0587.jpg http://i91.photobucket.com/albums/k296/con...gh/IMG_0584.jpg http://i91.photobucket.com/albums/k296/con...gh/IMG_0597.jpg http://i91.photobucket.com/albums/k296/con...gh/IMG_0591.jpg Edited January 15, 2007 by M_R_205 Share this post Link to post Share on other sites
Sandy 191 Posted January 15, 2007 Impossible to quantify that exactly off the engine IMO, the only measurable proof is the spread of power and driveability. To achieve that end, the head will need to complement and support all the other elements, from the induction system, through the cam properties to the chamber, where it must be able to compress and efficiently burn the mixture and cam properties again into exhaust geometry and back again in a perpetual loop that varies with engine speed and load. Share this post Link to post Share on other sites
sutol 0 Posted January 15, 2007 Not how I would have done it but then I'm not an expert with 205's Share this post Link to post Share on other sites
bren_1.3 1 Posted January 15, 2007 ouch, looks like the cutters have clipped the valve guides? Share this post Link to post Share on other sites
Ahl 4 Posted January 15, 2007 Are those ports rough to the touch or is it just the photos? What are the short side radii like? (the bend at the bottom of the port) Share this post Link to post Share on other sites
M_R_205 5 1 Cars Posted January 16, 2007 (edited) it looks like something has caught the guide but at the same time it looks like they have been removed to do the cutting?? and the ports aint no babys arse but there smoth id say, as for the bend its gentle with no lumps a nice smooth flow, im starting to feel a bit better about the head i remeasured the valves and there slightly bigger than first thought... i think the best way to tell how good it is is just to stick it together and put it on the bogg bro`s dino as there going to be setting up the carbs, does anyone have any vauge idea of the powwer i should be expecting?? Edited January 16, 2007 by M_R_205 Share this post Link to post Share on other sites
