yoeddynz Posted August 28, 2020 Author Share Posted August 28, 2020 yeah this whole hunting tooth thing was new to me but its makes sense eh. I like learning stuff like that Quote Link to comment Share on other sites More sharing options...
Nominal Posted April 1, 2021 Share Posted April 1, 2021 Old BH pic, 2007 I think. 5 Quote Link to comment Share on other sites More sharing options...
Popular Post yoeddynz Posted June 13, 2021 Author Popular Post Share Posted June 13, 2021 Well then..... so I'm going to now have to remove the terrible Datsun engine after having been informed its crap by some Barry commenting on my 'first drive' youtube vid. He stated the following.... "Why would you replace the high efficiency Imp engine with a Nissan updated version of the BMC A series engine? Imp engine is 875cc all alloy overhead cam engine with high grade steel bore liners, with crank balanced for 10,000rpm as standard. The A12 is an A series bottom end pushrod OHV engine with improved alloy cylinder head. The Imp engine can be easily tuned to 100 bhp per litre with just work on the head and carburation, as shave it to raise compression, bore out for larger valves and fit high lift cam, plus add twin carbs with Stiletto manifold. I don't believe you can get 100 bhp per litre from the A12 no matter what you do to it" I'm sure @RUNAMUCK, who's driven my Imp with this engine, or @kyteler would love to have a little chat about just how terrible the A12 is.... Anyway - my reply was this...  "Torque!, reliability, easily available parts inc so many performance upgrades, bomb proof bottom end, very strong crank as stock, only 15-20 kg heavier. Easy as to get 100bhp per litre! How about about a Tomei built 170bhp 1300 A12 ... https://www.youtube.com/watch?v=nRRHnvUhDbU&t=126s I've owned a stock imp before this and driven fast imps in the UK with the 875/930 engines. This engine, even as completely stock with a tiny Hitachi carb simply blows them away for usability and mid range grunt. It is also MORE economical. My only gripe with this engine is its upright position which has lost me some of the useful parcel shelf. But hey- that will soon be sorted when I finish my flat six swap. Oh boy- that'll upset the Barries! Haters gonna hate.... "   I look forward to seeing his reply.  Bloody barries 12 4 3 Quote Link to comment Share on other sites More sharing options...
mo999 Posted June 13, 2021 Share Posted June 13, 2021 38 minutes ago, yoeddynz said: Well then..... so I'm going to now have to remove the terrible Datsun engine after having been informed its crap by some Barry commenting on my 'first drive' youtube vid. He stated the following.... "Why would you replace the high efficiency Imp engine with a Nissan updated version of the BMC A series engine? Imp engine is 875cc all alloy overhead cam engine with high grade steel bore liners, with crank balanced for 10,000rpm as standard. The A12 is an A series bottom end pushrod OHV engine with improved alloy cylinder head. The Imp engine can be easily tuned to 100 bhp per litre with just work on the head and carburation, as shave it to raise compression, bore out for larger valves and fit high lift cam, plus add twin carbs with Stiletto manifold. I don't believe you can get 100 bhp per litre from the A12 no matter what you do to it" I'm sure @RUNAMUCK, who's driven my Imp with this engine, or @kyteler would love to have a little chat about just how terrible the A12 is.... Anyway - my reply was this...  "Torque!, reliability, easily available parts inc so many performance upgrades, bomb proof bottom end, very strong crank as stock, only 15-20 kg heavier. Easy as to get 100bhp per litre! How about about a Tomei built 170bhp 1300 A12 ... https://www.youtube.com/watch?v=nRRHnvUhDbU&t=126s I've owned a stock imp before this and driven fast imps in the UK with the 875/930 engines. This engine, even as completely stock with a tiny Hitachi carb simply blows them away for usability and mid range grunt. It is also MORE economical. My only gripe with this engine is its upright position which has lost me some of the useful parcel shelf. But hey- that will soon be sorted when I finish my flat six swap. Oh boy- that'll upset the Barries! Haters gonna hate.... "   I look forward to seeing his reply.  Bloody barries I can't help but agree with you, having owned a standard Imp (first car - prob not the best choice!) and then building a somewhat worked engine (as in mods listed by Barry) for another dirt-track race car, while it was fun we ended up with an engine that was mostly undrivable - nothing below 5K rpm then once on cam you were just going sideways at 9K rpm. What I would have given for a engine with low down torque! Pic of said weapon. 5 1 Quote Link to comment Share on other sites More sharing options...
yoeddynz Posted June 13, 2021 Author Share Posted June 13, 2021 Sweet- I never knew you'd had a couple of imps. Yep- to get a load more grunt from 875cc you need to deal with less usable torque and also an engine that is going to be even closer to it limits of reliabilty. I should have just replied to that barry with the word 'headgasket' 1 1 Quote Link to comment Share on other sites More sharing options...
NickJ Posted June 14, 2021 Share Posted June 14, 2021 I was sent this by a mate a few weeks back, something about the shame of being passed off the grid by an imp..   Sounds good though 3 Quote Link to comment Share on other sites More sharing options...
yoeddynz Posted June 14, 2021 Author Share Posted June 14, 2021 Ha cool. So nippy through all the cars at the start. Then gets hammered by the long legged big cars on the straights. Cool footage! 1 Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted June 14, 2021 Share Posted June 14, 2021 This been shared yet? So good  2 Quote Link to comment Share on other sites More sharing options...
NickJ Posted June 14, 2021 Share Posted June 14, 2021 8 hours ago, yoeddynz said: Ha cool. So nippy through all the cars at the start. Then gets hammered by the long legged big cars on the straights. Cool footage! Yeah poor guy is one cog short down conrod so just pulls over and lets them pass, then takes it all back under brakes, so cool! Quote Link to comment Share on other sites More sharing options...
yoeddynz Posted June 14, 2021 Author Share Posted June 14, 2021 He must be pulling some super high revs even then.  ... More then a horrid datsun pushrod can apparently do .... 1 Quote Link to comment Share on other sites More sharing options...
yoeddynz Posted June 14, 2021 Author Share Posted June 14, 2021 9 hours ago, flyingbrick said: This been shared yet? So good  Yep I've seen that. Its good eh. Looks like whoever (barry) put it up has made it by filming the doco (probably at some museum) with their phone - that reflection eh. 1 Quote Link to comment Share on other sites More sharing options...
yoeddynz Posted July 20, 2021 Author Share Posted July 20, 2021 So a fella on another forum has pointed out an issue I had not thought about and has put me in a mild pickle. I have a couple of solutions, one of which could improve other things at the same time. Lets see if anyone can guess my error. I'll give you all a clue. Starter motor.  Quote Link to comment Share on other sites More sharing options...
Nominal Posted July 20, 2021 Share Posted July 20, 2021 You gonna be spinning it backwards? 1 Quote Link to comment Share on other sites More sharing options...
JustHarry Posted July 20, 2021 Share Posted July 20, 2021 Fold out kick starter? 2 1 1 Quote Link to comment Share on other sites More sharing options...
Nominal Posted July 20, 2021 Share Posted July 20, 2021 Wind up clock spring starter like the lawnmowers used to have? 1 Quote Link to comment Share on other sites More sharing options...
tortron Posted July 20, 2021 Share Posted July 20, 2021 Â 2 1 Quote Link to comment Share on other sites More sharing options...
yoeddynz Posted July 20, 2021 Author Share Posted July 20, 2021 21 minutes ago, Nominal said: You gonna be spinning it backwards? yep- if I mount the subaru starter in its stock position I'll be turning the motor the wrong way. Didn't even think about that. Whoops. However I have a couple of options. Either use a Honda starter from a counter clockwise civic/accord etc. These rotate opposite to most starters. But I need to check the pinion tooth pitch. From what I can see via rock auto pics they are the same tooth count , 9, and look about the same diameter. I am guessing that most Japanese cars share the same pitch teeth on ring gears? Or I can mount one of my subaru starters from the front, over the engine. I have just checked and there's loads of room and will be easy to mount. It would also look more symetrical and the subaru starter was going to be pretty close to the parcel shelf if mounted above the box as originally planned. However if I do this I'll need to turn the ring gear around. Probably add some welds to stop it potentially getting nudged off because the flywheel retaining lip I had machined will now be on the wrong side. Nothing too drastic or unsurmountable in the grand scheme of this project and I'm lucky someone spotted it at this point! 7 Quote Link to comment Share on other sites More sharing options...
NickJ Posted July 21, 2021 Share Posted July 21, 2021 The average Hilman Barry would just re-wind the starter to rotate the other way 1 3 Quote Link to comment Share on other sites More sharing options...
tortron Posted July 21, 2021 Share Posted July 21, 2021 if you take a motorcycle starter apart and put it back together with the centre 180 degrees out it will spin backwards  does the subaru one have a bendix i guess 1 Quote Link to comment Share on other sites More sharing options...
yoeddynz Posted July 21, 2021 Author Share Posted July 21, 2021 Yeah I can do that- but also yeah it has a one way clutch and by the time I find/buy one of those that works the correct way I might as well get a honda starter. I have my starter motor squirrels out there looking for me and will have an answer soon. If the Honda route doesnt work I have worked out a way to use the scooby item. I'll put up more details in the next update. For now I have put the starter issues to one side and I'm concentrating on making a small pile of alloy filings on my vice as I play about with chain tensioners etc.. 1 Quote Link to comment Share on other sites More sharing options...
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