David S. Wallens said:It's such a pretty body.
I wish it ran.
"Maybe it's humidity."
" .... England is humid."
David S. Wallens said:It's such a pretty body.
I wish it ran.
"Maybe it's humidity."
" .... England is humid."
Knurled. said:IMO, if an engine needs so much "anti pollution stuff" that it becomes a nightmare of unreliability, then it has no place in the world.
And this is speaking as someone who plays with rotaries.
In 1971 Jaguar introduced it’s V12. An engine developed on a budget so tiny as to be petty cash for an American car company. Their volume some years was under 1000 units sold.
Yet they had to conform to the same rules as GM and Ford. While selling at a price less than 1/3 of what other V12 engines sold for.
The pollution systems they came up with while also being an early developer of Fuel injection suffered from the same issues later GM, Ford, Chrysler vehicles did. In the 1980’s and 90’s car fires became so common place they were called Car-B-Ques.
Decades later you’re looking back through the eyes of history and telling them they should have known?
pres589 said:I think you solve that with a Megasquirt or you go back to carbs, right?
Will a Mega Squirt accept input from two intake sources?
There are V12 Jags running Megasquirt. Not sure what you mean by two intake sources, but two trigger sources can be combined and used, or it can probably be set up to just use one.
crankwalk said:
The sounds!
thats so sweet sounding.
Knurled. said:if an engine needs so much "anti pollution stuff" that it becomes a nightmare of unreliability
That statement would have applied to just about every domestic and foreign vehicle sold in the US in the mid to late 70s...they had to start somewhere.
Dr. Hess said:There are V12 Jags running Megasquirt. Not sure what you mean by two intake sources, but two trigger sources can be combined and used, or it can probably be set up to just use one.
Thank you. Jaguar uses two air intakes, one on either side of the engine. Side A and side B.
On a Jaguar the only thing that connects both sides is the mechanical throttle linkage.
Every other engine uses just one . From little 4 cylinders to 700 horsepower supercharged V8’s
I see the potential for conflicting signals. Imagine one cylinder isn’t working on side A. The signal input would differ from side to side. Whereas on any other engine with one throttle the signal strength would adjust to the slightly weaker input and everything would be fine
Maybe I’m overthinking this? That the computer would measure 11 cylinders operating and adjust accordingly?
In reply to frenchyd :
Modern standalone ecu's can do a lot.
Knurled. said:IMO, if an engine needs so much "anti pollution stuff" that it becomes a nightmare of unreliability, then it has no place in the world.
And this is speaking as someone who plays with rotaries.
Early solutions to pollution issues turned out to be not the best ones. Not just Jaguar, every company!
Are you looking at history and saying they should have known better?
pres589 said:I think you solve that with a Megasquirt or you go back to carbs, right?
Since I understand carbs, it’s my fall back. Rebuilding a SU, Stromberg, or Weber is kids play for me. Holley is easy enough if I can find the parts, Quadrajet takes a little more time but still doable.
Mechanical Fuel injection like Hilborn is rolling off a log and even early 1957-1965Corvette stuff is straight forward.
EFI ? Well I’ve replaced sensors injectors and pumps. Easy enough. But creating a whole new system and then modifying it to run properly?
That’s a stretch for a 70 year old guy. I’ll probably do it just to stretch my brain but I sure wish I had someone to dope slap me when I start to run around in circles because of something simple.
Isn’t like the linkage on a Quadrajet where it will only go together in a certain order to work properly.
Two actual air intake paths then. The only thing that would affect is the engine load measurement. The Megasquirt can be set up to use about anything. Do the two sides share a common vacuum? Either way, you could just take the vacuum from anywhere, left, right or common and feed that to the MAP sensor to get engine load. Or plumb the two intakes together and run a MAF sensor, or don't use either and use Alpha-N mapping, which is just throttle position and RPM based, which is what I run ont he Sportster and what I ran on the 4AGE 20 valve (individual throttle bodies, vacuum signal is useless.) If you are only running 11 cylinders, no, it's not going to correct for that. I don't think any EFI system will. You need to fix that missing cylinder, not hide it with EFI. I also recommend the dual MAP approach so you get barometric correction.
Google up some jag v12 megasquirt and see what people are doing with it.
In reply to Dr. Hess :
Thank you I went on the site and they immediately terrified me talking about the benefit of sequential injectors resting at 18000 rpm ( nope I didn’t get an extra zero)
Lot of focus on the distributor how modern cars ••••• But that involves a whole new ignition system and creating a trigger wheel etc. seems like more a focus on what is possible or can be done and very little on the real benefits. I realize modern tuners like to key stroke everything. But just get it running and then do all the creative stuff. Find out if it nets real power increases and at what cost.
they also said a single source wouldn’t work well that I need to replace the card with one for dual source. At least someone sells one.
I “enjoyed” the first few guys who spoke about “ when I get my V12 running we’ll have 4.” But that was 8 years ago.
I’ll keep reading and maybe by the time I catch up it will be relatively straight forward.
Oh, there is no common vacuum path between banks. Not that you couldn’t do a T and make one. However I think that’s why someone created that dual card.
Thanks again for the heads up on that site. Once I digest it completely it should make me more confident.
I procrastinated long enough. It has sold.
There is a running, driving example local to me for $2800 though...
In reply to Toyman01 : I’m trying to stay abreast of Jaguar pricing but at $2800 unless it’s a desirable post 1992 I think it’s someone who is over priced. Well the few pre 1992 convertibles might command that price.
In reply to frenchyd :
That's interesting. Everything within 100 miles of me is twice that. Several of them are north of $10k
Two air intakes, I think it used two basically separate injection systems, one for each bank.
It would look like a true work of art, converted to carbs, the linkage would be interesting. Would need 6 twin throat carbs, just how awesome would that be.....
frenchyd said:In reply to Toyman01 : I’m trying to stay abreast of Jaguar pricing but at $2800 unless it’s a desirable post 1992 I think it’s someone who is over priced. Well the few pre 1992 convertibles might command that price.
That seems normal for a running coupe that's not super nice. I don't know where you're looking for cars Frenchy, but that is what I've seen. Hell, people tend to want more for a running one.
In reply to yupididit :
I had a conversation with a few of the members of the local Jaguar club. Their estimate that had I sold my ABSOLUTELY RUST FREE SOUTHERN California XJS after fixing the seam on one seat and other minor things I’d be very lucky to get $2500 but $2000 was more realistic.
At those numbers it didn’t seem worth it and it’s become the race car.
Prices are on their way up.
Here's my local CLs results: https://appleton.craigslist.org/search/cta?auto_make_model=xjs
More cars asking above $10k than below $5k out of 10 cars.
TED_fiestaHP said:Two air intakes, I think it used two basically separate injection systems, one for each bank.
It would look like a true work of art, converted to carbs, the linkage would be interesting. Would need 6 twin throat carbs, just how awesome would that be.....o
6 dual throat Weber’s has been done to death. They are wonderful eye candy but extremely expensive. Plus just by themselves they don’t make that much extra horsepower. After I bought the carbs and manifolds I had to buy a complete set of jets and air-correction meters etc. in fact I bought three setsI’ then when the engine went on and off the dyno I bought even more.
I’d like to say the jetting and air correction etc. is well known but the fact is nearly every one I’ve had my hands on ( including my own) is different. Throttle linkage is pretty much the same as the Factory 4 Strombergs just more carbs. All the throttle shafts line up and are connected in the center of the engine. In fact you can use the fuel injection linkage to transfer the pedal motion to the required motion needed to operate the carbs.
The stock 4 carbs will flow 800 CFM while the fuel injection flows 1200 CFM.
are on their way up.I lre's my local CLs results: https://appleton.craigslist.org/search/cta?auto_make_model=xjMore cars asking above $10k than below $5https://grassrootsmotorsports.com/forum/grm/cam-choice/141059/page4/#replyk out of 10 cars.
As I said Post Jaguar’s ownership by Ford there is a new found interest in owning the XJS. People believe it will follow the price trend set by the XKE.
Pre Ford ownership the company was not in a good position and GM looked at buying it. However after doing their due dilegemce GM realized the only thing of real value was the New six cylinder which GM took to settle the unpaid transmission bills
At the 11th hour Ford came charging in and made a really impressive offer for the Jaguar name. Then spent hundreds of millions of dollars updating and improving Jaguar.
Cars built before Ford’s ownership lack all that and savy buyers know it.
As for using Craigslist asking price as a basis for calculating prices, I’m not sure that’s smart.
I sincerely hope I’m wrong, I’d love to sell mine for the prices they are asking.
In reply to frenchyd :
You have an email requesting that you take a voluntary 2 week break from the forum. If you have questions about that please respond to the email or PM me directly. If we see any further posts from you during the next two weeks, you may be banned from the forum.
Well, it turns out the $2800 running car, doesn't actually run. It just needs a fuel pump or relay or some undefined minor part.
I expanded my search some. Anything under $5k just stopped running. Anything under $3k quit a month or two ago. Anything under $1k is rusty.
But, the $800 one is back on the market so...
In reply to Toyman01 :
DO IT
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