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Post by Zed. on Aug 26, 2020 14:17:42 GMT
okey, more random wanderings... ADHD fueled wanderings caused a comparison of a Mazda 1.6 crank (shortnose if it makes any diference?) and a 'narrow-journal' Cosworth BDA crankshaft, the Mazda engine is shorter than the BDA (& Lotus twincam / crossflow / pre-crossflow that it's based around)! also of intrest (to me anyway) is that the Mazda B6 crank has a narrow big-end that is actually narrower than the BDA 'narrow journal' so maybe less friction OR did Mazda consider the minimum width to loading   mazda use 6 bolts to secure the flywheel...  Cosworth use 12 bolts (standard Ford cranks have 6 bolts & no dowels, subject of dowels thats another consideration for the Mazda crank / flywheel...)  another view..  more drusump thoughts to follow... Rich. |
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Post by Zed. on Aug 26, 2020 15:03:13 GMT
Drysump thoughts... I'm considering pump mounting and have the option of inlet or exhaust side of the engine, inlet side would mean relocating the alternator so I'm thinking exhaust side where the aircon compressor would live.. the general arrangement as I have settled with. this is an empty cylinderblock (with the chopped front of the 1.8 crank placed on the mainbearing (insulation tape used to create the bearing shell thickness) through the oilpump / front casing & head with cams placed in & camcover on top, thought I'd better fit the Hyabusa throttlebodies & Tony Law exhaust manifold for photographic purposes & to check the manifolds position in relation to the oilpumps new possble location. please excuse the aluminium block that the oilpump is resting on, neded something to allow the pressure-relief valve to clear tthe workbench and keep the pump sorta horizontal (ish, same ish as the cylinderblock)  side view.    the exhaust manifild needs 'adjusting' to clear as the collectors are where the 5's engine mount will be (another project is to make new mounts using 'silentbolc' type rubber bushings...)  shows the temporary bolts holding the manifold & the modifications to fit Vauxhall manifion pad to a Mazda cylinderhead...  throttlebodies   injectors mounted below, think (read as hope!) this will be neater than top mounting & as theres discussion between engine builder friends, making power & torque ![]()  the 'rampipes' (rampipes are what I was tought, also as Dave Vizard terms them so good enough for me! other names include trumpets or velocity-stacks) that Suzuki use are rubber, gen1 Hayabusa run 2 short (outer pair) & 2 long / angled (inner pair). gen2 Hayabusa use 4 identical 'long' / angled items so I've used these for this mockup. the rampipes have a 'groove' moulded into them to accept an airfilter baseplate so I'm going to test-fit a K&N 'universal' airbox as I have one in the workshop similar to  the rampipes are positioned pointing foreward in this & previous photos.  and I've turned this one to point downward  their flexability is not just in their rubber construction  more to come as I work out the oilpump's drive pulley positioning & attachment - have ideas already but these can change... Rich. |
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Post by Zed. on Aug 27, 2020 22:43:51 GMT
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Post by wannabe on Aug 28, 2020 17:16:15 GMT
Is there a risk of heatsoak in slow-moving traffic if it's near the block? (I guess it depends if this is purely track or partly road-use ) |
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Post by Zed. on Aug 28, 2020 17:42:18 GMT
Is there a risk of heatsoak in slow-moving traffic if it's near the block? (I guess it depends if this is purely track or partly road-use ) thats a minor risk compared to the radiated heat from the huge bunch of bananas that serves as an exhaust manifold  air ducting through the rad & oilcooler etc. will quickly cool the underbonnet area but I've done some work designing a 'sumpguard' & undertray setup (the sumpguard is more of a subframe skid tan sump protection, especially as the sump will be higher than the steering rack ) the undertray setup will hopefully enclose the lower enginebay & create a venturi effect somewhere around the bellhousing / bulkhead to use the transmition tunnel / floor area as the 'low-pressure' area to draw from.. any bonnet vents would hinder this effect but I will not be going as far as taping the bonnet gaps to seal the area *  if you understand what I mean Rich. *ocd aero sillyness!!! |
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Post by dadbif on Aug 31, 2020 8:50:44 GMT
You’ve made it! Pics of your engine on Miata.net 🙄
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Post by Zed. on Aug 31, 2020 11:55:24 GMT
You’ve made it! Pics of your engine on Miata.net 🙄 interesting that the op was getting lectured on how itb's are bad & standard / single throttle area is good although I do agree that fi & itb's = problems, even the mighty Group B rallycars kept to a single throttle area but was that for ease of manufacture / K.I.SS.S OR just as it worked??? Rich. |
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Post by Zed. on Sept 9, 2020 15:11:35 GMT
I've machined a crankshaft outer / alternator belt pulley to remove the foreward / second multi-vee (aircon & powersteering drive) area as to shorten it, this reduces its length & allows me to allow for the drysump pum's drive pulley fitment without adding too much extra length to the engine, this also lessens the distance that the oilpump 'hangs' in mid space and this further complicates the mount bracket & designing in strengthening gusseting to stop it flexing - there will be an engine speed / rev harmonic that will start a wobble in the bracket and I'd prefer if this didn't wobble enough to throw the drivebelt.... ^^ more thought needed.... also started making a drilling-jig to alter the cars bulkhead for the bias-pedalbox's twin mastercylinders, this is partly due to my not using the (convienient but slightly too wide for the ballance bar) origonal Mazda brake-servo mounting holes in the bulkhead & partly as I have a few pre-made bulkhead plates that have closer cylinder centres. the jig is a chunk of steel bar that I've machined in my lathe to have a spiggot that sits in the cars servo-hole and will have some suitably placed pilot holes for drilling through into the bulkhead  easy for me to make but harder to describe and as pictures speak a thousand words, I've not taken any photo's to follow  Rich. |
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Post by Zed. on Sept 10, 2020 22:49:25 GMT
okey,  intermittant cutting, almost as fun as thread cutting.   to go in here, can see the 'new' closer bolthole centres....  to drill these.  sorta like this.  from behind. now to weld a tag on the jig to position it onto the bulkheads stud that aligns the pedalbox before pilot-drilling the jig plate. and the crank pulley, un-interesting machining job, the outer is cast iron & the inner is steel - the iron was bloody messy to cut as is usual....   this is a temporary bodge to assess dimensions & clearances, will probably make an underdrive aluminium pulley to slow the alternator & waterpump speeds... now can get on with pump-bracket making... Rich. |
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Post by Zed. on Sept 13, 2020 11:12:50 GMT
So, ebay & hermes strike again  the oiltank I bought is now missing in transit.... - the seller messaged on the 14th day after auction end to say he hadn't noticed it sold then a few days before marked sold... then tracking showd dropped off @ hermes / parcelshop yesterday... now..... so the driver has stolen it  will give it a few days to see if its found W-anchors... Rich. |
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Post by Zed. on Sept 13, 2020 19:42:45 GMT
So, ebay & hermes strike again the oiltank I bought is now missing in transit.... the seller messaged on the 14th day after auction end to say he hadn't noticed it sold then a few days before marked sold... then tracking showd dropped off @ hermes / parcelshop yesterday... now..... so the driver has stolen it will give it a few days to see if its found W-anchors... Rich. looks like they found it.... the cynic in me wonders if the driver decided it wasn't interesting so re-wrapped & added it to the next load Rich. |
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Post by wannabe on Sept 14, 2020 2:19:10 GMT
I hate postal services!
They can bring nice stuff, but when it fails...
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Post by Zed. on Sept 14, 2020 11:53:13 GMT
so...... It's landed  and seemingly undamaged or tampered with (although it was 'wrapped' in bubblewrap & blue insulation tape - no box or bag  ) So, happy bunny time Rich. |
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Post by Zed. on Sept 14, 2020 16:35:41 GMT
oiltank thoughts....  the tank is a Pace Products / SBD item, specially made for Caterham / Westfield 7 type cars with Vauxhall 2L 'XE' engines, it's 500mm tall & 100mm diameter with ~4L overall capacity. the tank will run @ 3/4 capacity but theres an oilcooler, oil pipes & remote filter to be considered for overall oil capacity - so about 4L total  for idea of size in the car's cockpit...  it's final fitted position will be between the bulkhead & dashboard (hopefully!) with access to the filler-cap through the plenium between the windscreen & enginebay / the origonal heater air intake duct with the heater motor being relocated or possibly a small 'kitcar' type heater replacing the origonal Mazda item.... Rich. |
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Post by niklas on Sept 15, 2020 18:27:24 GMT
You do realize that I expect wide slicks on this car. Not many dry sump 5's out there.
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)
le sigh