RE: [Bluebird510] What's new? --- Mikuni "Lean out" problem solved
nandjm...@bellsouth.net
Since Paolo asked……
Many people running Mikuni 44PHH Carbs on track with sticky tires have experienced a lean out issue on right hand turns. This is caused, in large part, by the grip of modern tires not being aligned with the G-force that the Mikuni’s were designed to handle. The fuel in a near 1G right hand turn tends to end up out of the float bowl and onto the left strut tower.
The historical remedy to this problem has involved filling the bowl vent slot with JB weld and drilling a new vent location in the top of the carburetor cover.
As the value of Mikuni’s continues to go up I was determined to find a “no permanent change” solution to this problem.
Problem solved at last…….
A test at VIR a couple weekends ago has proven my fix.
There are 4 round holes in the gasket between the carburetor body and the top cover. The holes provide a vent path from the bowls to the area in the top cover that leads to the vent exit hole on the face of the carb above the intake throat (the face where you mount an air filter or velocity stack). I purchased an $8.00 bag of plastic plugs and corked the two vent holes closest to the strut tower. The bowls still vent properly through the two remaining holes closest to the cylinder head. The plugs are made from the plastic used to make gas cans and should be happy in the fuel environment. The fuel can no longer slosh up and out of the bowl when turning right. Problem solved, no more lean-out, faster corner exits are now possible.
Nathan “no carburetors were harmed in the making of this solution”
From: blueb...@googlegroups.com <blueb...@googlegroups.com> On Behalf Of paolo
Sent: Wednesday, October 13, 2021 8:26 PM
To: blueb...@googlegroups.com
Subject: [Bluebird510] What's new? --- Re: Balls To The Wall Datsun 510 {historians}
It seems we've become a syndicate of 510 history buffs or technophobes. Not a bad thing, per say, yet I'd love to see more techno content. Whats new?
"Get up to speed folks..."
Paolo ———
On 10/5/2021 7:01 PM, Ronnie Day wrote:
IIRC, the C&D BTW article was published in the same period that Hot Rod did a two part article on the 510. I know I have the parts list that lists what bits C&D used. There was also a HR piece on the "Dyno-Tune" kit. I have all of them in a binder along with other period 510/Z-Car articles. including many Comp Department catalogs, parts and "How to..." bulletins. I pretty much collected all of the Datsun related printed material I could find. Remember, no internet in those days!
The AF sent me to Hickam in January '73 and we shipped our original '71 4-door to Hawaii. On the way to Travis in NorCal I made a "slight" detour through El Segundo and bought suspension bits from BRE and had them shipped to my APO box. After the car and the pieces arrived I installed the kit in the parking spaces in front of our Waikiki apart!
Over the next year or so, I stuck in a Norris cam, Z-car valves, did a mild port job and installed a 2 & 1/2 inch exhaust with a removable turbo muffler on the car. I also installed one of the dyno-kits that had become popular and later installed a single Weber 42 DCOE on a Warneford manifold. That really never worked that well and I finally put the massaged Hitachi 328 back on the car. It was a fun car to drive especially with 22 inch tall slicks.
Talking about parts prices, if you can get your hands on a copy of the (I think) March '72 Motor Trend that contains the two page picture of the yellow "Brockbuster". It includes a parts list with prices that will literally turn you green with envy! Remember, though, the spring of '72 was a hell of a long time ago and you'd have to allow for inflation if you could even get the parts!
RD
On Tue, Oct 5, 2021 at 6:45 PM Ted Hedman <thedm...@gmail.com> wrote:
What I like is that for the price of a new 510 plus full BTW kit plus some wrench skills and perhaps a copy of Bob Waar’s Bible, you got a car that could run from a stock 2002 for about the same price, and seriously harass the even more expensive 2002tii. Not that you’d be cross shopping a new 2002 on $1.60/hr, but you could add the parts as time and money allowed and eventually get there.
Sent from Mail for Windows
From: paolo
Sent: Tuesday, October 5, 2021 3:35 PM
To: blueb...@googlegroups.com
Subject: Re: [Bluebird510] Balls To The Wall Datsun 510
It's all just history.
For those with sufficient age and adequate memory, recall the going minimum wage back in 1970-ish. I recall about $1.60. The average worker's wage (target one who would consider a 510) could not have been earned much higher than that.
I remember this well as I started my first job at a bike shop in '72 and the owner gave me a $0.07 over minimum wage starting wage as I outperformed the existing 20+ yr olds currently working at the shop during my 'apprentice' period (a.k.a. two wage free test days). I as about 14. Never having worked for a real job with a wage before, man was I proud.
I saw my first 'tuner' 510 at that shop via a customer who drove up in a rather loud, custom painted, flared, lowered 2-dr Dime. A handful of young folk gathered around the car in the parking lot (the whole front wall was glass) as we did bike-shop business getting the owner a new 10-speed. A Fuji as 'Finest' I recall.
Nice shiny paint but I was not impressed with his car as my dad had a stock 510 wagon. It hauled (stuff)! I also only cared about bikes and racing bikes. Naturally that would change after I started to rely on a car to earn a living and re-discovered the 510 in the early 80's.
Paolo ———
On 10/4/2021 9:39 AM, 'Andy Klink' via Bluebird510 wrote:
Yeah, but think of that in relative terms - that's about 50% of the price of a brand new 510!
Then again - look at the difference between a stock new Mustang GT and a Mach 1. Almost 100% difference depending on how equipped.
On Sunday, October 3, 2021, 07:25:38 PM PDT, Carter Boad <car...@electroimpact.com> wrote:
The prices on that BTW sheet kill me!!!! An entire car’s worth of modifications for $1,000?!
My wife got me an awesome book about Don Nichols and his Shadow racing cars.
She even go it signed.
--carter
From: blueb...@googlegroups.com <blueb...@googlegroups.com> On Behalf Of Ted Hedman
Sent: Saturday, October 2, 2021 8:44 PM
To: alvi...@gmail.com; 510 List <blueb...@googlegroups.com>
Subject: RE: [Bluebird510] Balls To The Wall Datsun 510
Cool pics with Trevor Harris and the Shadow Mk 1.
Air brakes?
https://www.zcarblog.com/wp-content/uploads/2021/08/IMG_6729.jpg
Sent from Mail for Windows
From: Alvin Gogineni
Sent: Friday, October 1, 2021 8:19 PM
To: 510 List
Subject: [Bluebird510] Balls To The Wall Datsun 510
Apologies if this has been posted already.
In my interview with Nissan F/GT 240Z team member and former parts manager Tom O'Connor I asked him what the "BTW IV" decal on the BRE rear spoiler meant. He sent me these scans describing the origins, and it is quite interesting.
original zcarblog feature:
BTW scans:
Comp Parts Bulletin highlighting how to to build a "BTW" car:
Article on the BTW 510 ( two pages)
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Dan Heil
To view this discussion on the web visit https://groups.google.com/d/msgid/bluebird510/013901d7c115%24733758c0%2459a60a40%24%40bellsouth.net.
1987 Yamaha 250SRX
And 510 wagons!
Ted Hedman
Sounds like a nice fix. I epoxied mine, but never drilled any extra holes. Seemed to work. If you want to get rid of any surplus plugs from that 8$ bag, let us know.😊
Ted Hedman
Now that I've seen the pic I think I might actually have a few of those plugs. Thanks for posting.
“Pictures or it didn’t happen”
See attached.
From: Dan Heil <mack...@gmail.com>
Sent: Thursday, October 14, 2021 12:16 PM
To: Nathan <nandjm...@bellsouth.net>; Bluebirds Google Group <blueb...@googlegroups.com>
Subject: Re: [Bluebird510] What's new? --- Mikuni "Lean out" problem solved
Nathan,