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Post by atlex on Jul 5, 2021 22:08:28 GMT
re the b6t head, would be interesting to compare the scalloping with those on Fizbne's head (there are photos, somewhere in his thread)
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Post by Zed. on Jul 6, 2021 10:19:30 GMT
re the b6t head, would be interesting to compare the scalloping with those on Fizbne's head (there are photos, somewhere in his thread) hummmm.... diggin has happened... found this in Fizbne's wanderings (seriously make mine look coherent!  ) mighty5s.com/post/43229/thread   but photo's don't show if cast or machined reliefs in the cylinderhead - these photo's don't have much detail BUT I'm torn between the edges being straight (machined) and the corners rounded (cast)  some google-fu later crossreferencing the camshaft s/n in his engine and found some interesting things... like Fizbne's reddit wafflings!www.mx5nutz.com/threads/name-these-cams-and-wheels.154627/different cams but cylinderhead relief...   - again these photo's don't have much detail BUT I'm torn between the edges being straight (machined) and the corners rounded (cast) Canoenose  Rich. |
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Post by Zed. on Jul 8, 2021 9:11:52 GMT
more B6t head stuff... stripped the head & sent it through the partswasher for 2 cycles.  bit cleaner!  the old headgasket material was seriously welded to the head surface, lots of swearing & scrapeing to remove   general condition looks good considering it was an old rallycar turbo engine & had been idle for ~20+ years...  inlet ports seem to be same shape as the later B6ze(rs) heads as on Mx5's.  same with the exhaust ports although the 'short radius' / lower edge of the port seems smoother and nicer shaped than the Mx5 heads I've seen - doubt it's anything special though  I've included this photo as it shows the coolant passageways accross the chamber & ports from the thermostat area (rear of head so number 4 cylinder) - interesting to me anyway.  the cam bearing / cam follower gallery.  closer photo showing the machined relief to allow cam-lobe totation / clearance. I'll measure the standard head on my silver car to compare a production 1.6 Mx5 later.  exhaust camshaft fitted. this is a 'standard' 7.9mm lift camshaft BUT I have no idea if it's a turbo or na item (Mx5 also used 7.9mm lift).  closer view.  3/4 view, plenty of space for more aggressive camshaft  more to follow... Rich. |
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Post by Zed. on Jul 8, 2021 18:44:52 GMT
looked at another head, this one is on the silver car - Nov 1991 build Eunos Roadster with a Long (Big?) nose crankshaft engine that went well BUT had dubious casting of an inlet port...  ~180,000km (110,000 miles?) has taken it's toll, lots of burnt oil staining on the casting  seemed to have hardly any 'relief'  hard to see any gap between cam & follower-boss.   better photo.  again, no visable relief cast into the head..... as I was playing, decided now was a good time to test-fit (or, find out how much it doesn't fit?) the Tony Law exhaust manifold...  it nearly fits!  plenty of room around the bulkhead / number 4 primary pipe.  but it doesn't fit to the head - something is holding it away - can see how far away number 2 & 3 primary pipes are from the cylinder block / close to the chassis.  the offending collision. I knew this was going to happen & have plans afoot to alter pipe angles rearward (known since I bought the manifold as a gamble....)  better photo of the (hopefully) final positioning-ish, can now better plan oil-pipework from pump to oiltank.  the hight of the pipes   and proof that the bonnet needs massaging (or removal of some internal braces?) paint will burn & aluminium bonnet-skin may melt!  and, in the great tradition of 'because' I test-fitted the 323 camcover....  not sure if I prefer the origonal Mx5 type more to follow, may cut / section the head on the silver car as it's 'spare' as I want to see where the coolant jacket is in relation to the ports - for scientific purposes obviously  Rich. |
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Post by Zed. on Jul 8, 2021 21:53:30 GMT
curiosity got the better of me & I decided to check where the manifold hit the bonnet...  tried copperslip on the obvious (tallest) primary pipe - number 3 & there was no witness-mark on the bonnet.  spread some on number 2 primary & had a result...  here.  and on this brace, do I remove the brace or just trim to make clearance? also, curious as to what cams were in the silver car & compare p/numbers with the cams that were in the turbo engine.  B660 & B61P in the silver car.  B660 lobe shape.  B61P lobe shape, looks to have more duration?  B660 in both inlet & exhaust from the turbo engine. google says that B660 is the 1.6 115hp inlet cam and the B61P is the 115hp exhaust cam. ^^ this begs the question about the pair of B660 in both inlet & exhaust from the 323 turbo engine, in-ex conversion? Rich. |
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Post by moclan on Jul 9, 2021 5:54:35 GMT
For the bonnet, by trim you mean hammer right?  |
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Post by thruxton on Jul 9, 2021 10:25:30 GMT
That bonnet will be running at "F"-hot!
Maybe a rethink is in order?
Regards.
Rich.
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Post by batou on Jul 9, 2021 11:45:45 GMT
M2 1006 bonnet needed....   |
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Post by dadbif on Jul 9, 2021 14:35:50 GMT
I bet even that wouldn’t clear it.. a bit of hammer massage required.
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Post by Zed. on Jul 9, 2021 17:52:51 GMT
okey, once the manifold face is bolted to the head the primaty pipes will rotate slightly & also drop ~1/4" so probably giving the needed clearance.  can see the gap @ front and touching @ rear, this is due to the 1&4 pipe 'collector hitting the engine mount cover. if I have to 'adjust' the bonnet frame then so be it I do have a spare bonnet so not the end of the world moclan , needs must thruxton , already re-thunk and it's staying like this as it suits the engine-spec I'm building (manifold was secondhand and even after modifying it saves me ~£400 on a custom made item)  batou , that bonnet looks like it was from a Camero, or maybe a homage to the Chevette HSR type? dadbif , maybe Rich. |
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Post by batou on Jul 9, 2021 18:30:46 GMT
batou , that bonnet looks like it was from a Camero, or maybe a homage to the Chevette HSR type? Thats the M2 1006 dubbed the "CobraSter", had the 929's Quad-Camshaft, 24-Valve V6 I think theres probably maybe one or two in the world |
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Post by Zed. on Jul 9, 2021 18:59:42 GMT
stripped a pair of rear hubs from lower wishbones today.  went medeval on them with a hacksaw as I wanter the huns but didn't trust the ~31 year old wishbones...  I bodge therefore anyway, on a different track, was looing at engine valves, can buy supertech items (with varing reports on quality?) from hamerika but thought I'd look if REC listed anything Mazda suitable... www.gsvalves.co.uk/race-engine-components.htmlfound theit homepage. www.gsvalves.co.uk/assets/race-engine-components-catalogue.pdfseperately a catndog listing pdf...  with this snippit will email or maybe phone in the future & ask if theres anything available & possibly lighter than the mentioned turbo spec items... more tangents to follow... Rich. |
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Post by batou on Jul 9, 2021 19:24:31 GMT
I used G&S valves on my Mini R53 race engine build, they had no issues running at 7,800rpm with ti springs/retainers (oem rev limit was 6,800) with mild boost supercharged) |
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Post by Zed. on Jul 10, 2021 17:26:35 GMT
Buggerit, heads coming off the silver thing & getting sectioned  Rich. |
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Post by Zed. on Jul 10, 2021 20:51:36 GMT
right, head off & it don't look bad  I was expecting the bores to be worn & all kinds of hell in the chambers / piston crowns  not great, not terrible  much burned oil ![]()  ![]() sooty but clean, was running a bit rich before stripdown but when driven was nice  wiped over with a petrol (E5?) soaked rag & revealed shiney pistons...  as I had the rag, wiped the bulkhead and managed to remove some of the rusty coolant leak staining. also, something I forgot to add a few days ago...  standard 1989/90 Mx5 B6ze(rs) cylinderhead front face.  1986 Mazda 323 turbo B6t cylinderhead, the coolant port id blanked with a coreplug and not drilled to accept the Mx5 type thermostat housing. also, the casting seems to be much smoother and neater. another add, camshafts...  the B6t head & B660 cams (fitted) the other cams are the 115 hp Mx5 items... note the numbers 1 & 2 in the shafts (between front bearing & first lobe), was this relavant to intended use & the B6 as a 16v engine's roots as a turbo primarilary then na in the 323?  the rear of the inlet cams.  rear of exhaust cams. the older cams from the 323 turbo also have nicer / smoother cast surfaces - due to age or blind luck? Rich. |
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le sigh
Jul 15, 2023 20:03:52 GMT
le sigh
Jul 15, 2023 20:03:52 GMT