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Posts
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Joined
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Last visited
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240 ExcellentAbout Jonny Hart
Find me at:
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Website URL
www.classicretrofit.com
- Youtube
Profile Information
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Location
Back of beyond, East Sussex
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Interests
Design; buildings, cars, tools, gadgets, interiors, landscaping.
Music; funk, soul, disco, alternative, krautrock. silly prog.
Previous Fields
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Current 911
'82 SC, '75 914EV
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Daily Driver
911 SC
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Lottery Car
Miura, Fisker, something daft.
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Day Job?
Company Director / Control Systems Engineer
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Favourite Food
Italian, Asian
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Drink?
A small continental beer, whiskey sour
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Drive of your life
Mille Miglia
Recent Profile Visitors
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Side sills delete pics
Jonny Hart replied to gt two's topic in Body Restoration - resto threads only
Yeah, looks crap without the covers... FWIW, you have to lose the chin spoiler to get 'the look' and have the ride height spot on. -
^ Yup. I only noticed this some time later but the round plastic cover that hides the boss behind the wheel must be slight smaller diameter on a 924 . This means that it doesn’t perfectly match the round on the stalk cover. There’s maybe a 2mm gap. TBH you would struggle to notice this unless pointed out.
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Yes, chap called Rungroj who has this place: https://www.911assistant.com
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Referring to your photo, the bent part snaps into the cutout of the clip. Are you snapping it in? The rod should be straight when in properly.
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Testing spark plug wires
Jonny Hart replied to Northy's topic in Ignition System (not starter) and ECUs
You can unscrew the plug end from the lead. There’s a brass screw in there - sometimes it’s not even in the centre core of the lead. There are 3 x 1k resistors in the cap. The leads themselves are about 1k depending on length. There’s 5k in the rotor making a total of about 9k which is the design spec for the system from coil to plug. -
How little did you pay for your IB (back in the day) ?
Jonny Hart replied to GaryH's topic in Impact Driver Chat
£6,995 in 2011. Listed on eBay with one photo taken in the rain - auction expired with no bids. First car I saw. -
Timing mark walking at idle
Jonny Hart replied to Northy's topic in Ignition System (not starter) and ECUs
Ok, I'll chip in here. If you are running a standard CDI or our CDI+ straight out of the box (no map) it fires immediately on the distributor signal and any jitter will be down to the engine. Remember, the engine does not rotate at a constant RPM, it is being accelerated 3 times per revolution by the combustion event. It only feels smooth when you drive because the wheels are attached to a great big mass called 'the road' - this effectively is like a huge flywheel attached to the engine. When the engine is idling, however, the timing light shows up every 'kick' of the combustion so the timing appears to jump about. Now, if all that sounds a bit 'hit and miss', when the engine/transmission is hooked up to the road, these problems disappear because of the flywheel effect previously described. That is, the engine IS now rotating a a steady RPM and the timing will not wander. If you used your timing right on a rolling road you would find the light is much more stable. If the CDI+ (or any other electronic ignition for that matter) is running a map, it must compute in software the RPM by measuring the time between every combustion event ( 3 times per revolution). As the engine is accelerating and decelerating between these 'kicks' a steady RPM calc depends on the engine running as smoothly as possible per cylinder. The calculated RPM is then used to calculate a time in the future to fire the spark based on the advance required in the map. So you can see that if one cylinder is under performing, then the engine will slow down for 1/3 of a revolution and the timing calc will be upset. This is what causes excess jitter on a timing lamp. The upshot is that when timing with no engine load, just take the 'average' of the light 'scatter' as the reading and don't worry about it too much! -
Agree, a car is a just a object moving in a 2d space with a few obstacles. It's not that hard a problem to solve. Maybe they have a dedicate lane or other operating constraints. I for one would be quite happy to trundled home from the boozer at 20-30 mph. Less terrifying than a late night minicab and no mindless banter to contend with. Everyday people get on autonomous flying objects travelling at 500 mph...
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I’d love to hail one of these back from the pub. https://www.topgear.com/car-news/first-look/verne-concept-heres-your-first-look-mate-rimacs-driverless-robotaxi
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Turquoise, yes turquoise restomod A46 Evesham
Jonny Hart replied to njpcarrera32's topic in Visual Impact
Probably this one and yes it was at Boxengasse... https://www.thornleykelham.com/classic-car-bespoke-commissions/ -
Frank knocked it out of the park again. So many rare and interesting cars. The more mundane stuff like Carrera GTs (3 of them) were parked near the loos.
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^ Check out the Boxengasse Instagram teaser pics.. Gonna be good.
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Interesting, I thought Flat6 didn't have that much to see compared to Boxengasse last year. Boxengasse has been better year on year so have high hopes for this one. We need to be supporting these events. Massive amount of effort to put on, the staff, parking, getting show cars to site, trade stands, infrastructure, insurance, weather risk etc. If you want to save that extra tenner, simply miss one coffee and a bun between now and the 11th August. Pushing the ticket price down will ultimately mean a lesser show - race to the bottom. BTW, Luft is $110 for an early ticket (with car) and $60 general admission.
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For those stuck in the 90's, it's now 2024 - a kebab is £10, a packet of fags is £18. Amazing collection of race cars last year. I'm going.
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NO WORDS!! Just YOUR Impact Bumper pics. Use the like button 👍🏻
Jonny Hart replied to Ducktail's topic in Impact Driver Chat
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