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Re: What's a budget way to increase cc's in an a12? |
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Joined: 2010/3/20 12:20
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Be thankful you are not in Victoria or if you visit remember unless they changed the speedo drive gears in the gearbox your spedo reading is out and in Victoria they can and will book you for 1 kmh over the limit.
Easy to pull the speedo drive unit from the gearbox to check if they changed the driven gear which is the one Nissan change to take into account different differential ratios.
You may want to drain the gearoil before pulling the drive unit from the gearbox it is the part the speedo cable screws onto held in with one bolt.
Good explanation is in the tech wiki with photos
Posted on: 2021/11/25 5:44
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Re: Greatest budget Giant killer Datsun all out champion |
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427 Cobra is no contest unless a really talented driver having spent a week modifying a 427 Cobra front suspension to eliminate bump steer which I eventually got down to a toe change of just 2mm over the full suspension travel and an even camber curve that worked. Much cutting and repositioning of A arms mounting points and fabricating A rms with the correct lengths.
I also hand made sand bent extractors with 2 inch primaries for the same race car what an effort to get them equal length and to fit in the tight confines of the engine bay, Worked great in the end but a Datto is just so much easier to engineer than one of Carrols beasts.
The guy I worked with at the time was a nephew of one of Shelby's original workers back in the day of the GT 40's and Cobra's and had many insights from his uncle into what needed doing to make a Cobra work, Most Cobra's are poor replicas and even some of the real ones vary so much over the years depending on what components were used.
Would have been interesting times back in the sixties without our modern equipment to make things easier to fabricate
Posted on: 2021/2/13 3:35
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Re: Broken piston rings |
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Joined: 2010/3/20 12:20
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Something I have come across is that over the years people cook the engine and some numb nuts machines the head which has bowed from the overheating and surprise not they lift up in the centre and with overhead valve engines you do not come across the warning sign something is not right the cam shaft does not turn freely like for instance in an L series engine.
Where it becomes an issue is the chamber sizes now vary with the end chambers being smaller and more likely to detonate simply because they machined a head instead of getting it straightened and then skimming it.
You need to cc the chambers and even a syringe from the vet will give you an idea if that is the problem,The correct method involves a burrette a plexi glass plate to seal the head gasket surface with a light smear of grease to make it seal and some kero to fill it and measure the volume.
Unfortunately whilst I have a burrette etc to do this job most do not so you have to ask around to see who can measure it accurately that along with detonation it causes are the most likely culprits that will need investigating I bet the issue started with the flat tops and increase in compression that pushed the end cylinder over the top compression wise so that cylinder alone detonated much harder to hear than all doing it together.
Posted on: 2019/12/27 10:40
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Re: Vega Engine |
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Home away from home
Joined: 2010/3/20 12:20
From Sydney Australia
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Quote: D wrote: Great links! yep single cammed iron heads that belonged on iron blocks definitely not high tech all alloy blocks with no experience or durability testing over time to expose its issues.
However Nissan or Datsun were amongst the best in the US but no more My Jap father in law would not go near a new Nissan with a 10 foot chop stick and neither would many Muricans these days.
That's what happens when the French get involved Renault ruined Nissan The truth from SK https://www.youtube.com/watch?v=8h_r_OuJU-w
Posted on: 2019/12/7 22:48
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Re: Gunson's colortune |
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Home away from home
Joined: 2010/3/20 12:20
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I use innovate motorsports LM series and datalogging useful as for road use dyno tuning is just a starting point as it often ends up too rich for road use and there is nothing like tuning for real world useage
Posted on: 2019/11/2 22:09
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Re: manifolds for Keihin Flat CR bike carbs |
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Home away from home
Joined: 2010/3/20 12:20
From Sydney Australia
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One big problem with FCR carbs is if you go below a 200 main air corrector jet they run very poorly as the factory type emulsion tubes do not have air bleed holes and under a 200 MAJ the mixture control turns to crap and power drops of significantly.
The equivalent Mikuni flatslide carbs as used on many Harleys do not have the same issues, CV carbs are a great option provided whomever is tuning them knows how to use air corrector jets to jet not just changing mains, Idles etc
Posted on: 2019/8/24 3:26
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Re: Pink Lilac metallic but just WOW! |
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Joined: 2010/3/20 12:20
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Berry Nice I would say
Posted on: 2019/8/24 3:17
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Re: Rare-er-er parts |
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Joined: 2010/3/20 12:20
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That is a conventional tacho but with the push of a button it turns into a voltmeter the inside measurement not so uncommon from Japan many 1980's Kawasaki GpZ bikes ran the same setup push a button on the dash to get a voltage reading from the tacho
Posted on: 2019/8/24 3:14
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Re: 60A bell housing bolts |
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Home away from home
Joined: 2010/3/20 12:20
From Sydney Australia
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A word of warning to everybody Jim Berry from Competition clutches in Brisbane sometimes referred to as Brisvegas found out the hard way on his clutch dyno there are now issues with some of the better brand name fasteners.
He had fitted "Unbrako" brand in-hex bolts to a clutch and felt something strange happen to a clutch he had just built when testing on his clutch dyno and found the bolts had stretched but not yet failed.
It seems that our old friends the Chinese are supplying sub Standard steels to some subcontractors even decent brands such as Excedy clutches he has found recently when rebuilding pressure plates for customers with race cars that the pressure plate diaphragm springs seem to be loosing way too much pressure compared to previous years when a customer returns his clutch for an overhaul for the next season of racing.
So a word of warning if at all possible try and source genuine Nissan Datsun bolts, Jim had to rifle through his scrap bin and retrieve the original Nissan pressure plate mounting bolts to finish the dyno test on that clutch
Posted on: 2019/3/31 3:31
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Re: What are Datsun B210 1974 proven rear gas shock options please help guys |
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Joined: 2010/3/20 12:20
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On my first 120Y (B210) 4 door I used Ford escort Bilstein group 4 spec shocks worked very well, With the popularity of historic rallying these are readily available these days
Posted on: 2019/3/31 3:20
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