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aeronca65t
Great Pumpkin
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If you have a couple of hours, this is pretty good.
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Vizard talks about engines
- Thread starter aeronca65t
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aeronca65t
Great Pumpkin
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And if you have less time, this is sort of entertaining:
Foothillinkeeper
Freshman Member
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That's a great cut away.
It would answer a lot of questions.
But, one thing???
Isn't it running backwards???
It would answer a lot of questions.
But, one thing???
Isn't it running backwards???
Jim_Gruber
Yoda
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All it takes is $.
bugedd
Jedi Knight
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That was an interesting topic. I know very little about the subtleties such as the valves he spoke of. Bet he builds one killer motor. I'd like to build my own motor one day, something I've never done, but with all the details that I don't know about, it would not be as good as I'd want.
G
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But I bet it would be better than you need. It seems things have progressed too far, too much science and understanding. We now have guys with computers and dynos studying things and discussing them to such a minute level it discourages novices from tackling the job. It aint rocket science, it's engine building... Bottom line is you probabaly have more understanding being inexperienced today than the guys at BL had who put these things together 40+ years ago.
If you want it perfect, send it to Hap. If you want to rebuild it there's no reason you couldn't do the job yourself. This was part of the reason I built my motor out of spec. I wanted to show guys like you you don't have to have infinite knowledge, a $30,000 shop or have things absolutley perfect to do it yourself. Yes, your stuff needs to be as clean as possible and within a somewhat reasonable spec, but you don't have to own a machine shop or have a pile of cash to build it yourself.
Some folks enjoy the relentless pursuit down to the .0000000001 degree. That's fine for them but for guys like me it takes all the fun out of it. If you want a car you can enjoy driving you don't need an aerospace grade engine to do it. Nial and I have already shown that, 35hp and out-of-round crank and all.
GET OUT THERE AND BUILD THE THING !!!:thumbsup:
I guarantee you'll come out with a better engine than it left the factory with.
You can do it, we can help!
errrrr....more like "they" can help.
I'm a "don't try this at home" kinda guy. :grin:
G
Guest
Guest
Guest
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I can see where those valves may reduce reversion some but they won't sove the problem of the closing valve forcing the air behind it back up the port. I think Smokey Yunick summed it up best.
"The internal combustion engine is an 80 year old prostitute that folks keep trying to turn into an 18 year old virgin."
"The internal combustion engine is an 80 year old prostitute that folks keep trying to turn into an 18 year old virgin."
bugedd
Jedi Knight
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You are right, the car is a spirited driver, not a racer. I'd love to see 100+hp out of it, just enough to give me that thrill of my last car. Enough to scare me a bit 
With that, maybe Hap building the head and buying the matching parts such as cam, pistons (for matching compression), and I can do the assembly from there. And send it out for machine work of course. We will see. Too many projects, not enough time. But as I tell my 9 year old son, it only has to be done when he is able to drive. I think it would be cool for him to take his date to prom in it
With that, maybe Hap building the head and buying the matching parts such as cam, pistons (for matching compression), and I can do the assembly from there. And send it out for machine work of course. We will see. Too many projects, not enough time. But as I tell my 9 year old son, it only has to be done when he is able to drive. I think it would be cool for him to take his date to prom in it 
Trevor Jessie
Yoda
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For a streetable sprite engine that offers thrills. Try a supercharger. Gobs of pulling power start at 2000 rpm all the way to 6500.
G
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Even if it were a racer it still wouldn't matter if all you're looking to do it get out there and have fun. If Nial can do it with a 35 hp stock 948 I don't see why you wouldn't be able to have a blast with a mild home-built 1275. From my experience, winning races isn't about who's best on the track, rather who's the best at writing checks.
bugedd
Jedi Knight
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Well, when you go from an all wheel drive rally car at 350 hp to a bugeye, you can see where there is a bit of a gap in thrill. So the bugeye will need to be pretty aggressive to get a similar scare the pants off sensation. My 50hp or so 1275 is a bit tame. 100+hp might get there. And a supercharger, way out of budget. But I can only imagine. What would be scary fast is the same 4g63b turbo Mitsubishi motor in my Galant VR4 at 350hp in a bugeye. Yikes!
Hap Waldrop
Yoda
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Getting 90 HP from a 1275 engine is very do-able without breaking the bank, are you going to do it for a $1500-2000, probably not, but probably for $3000-4000 assembing yourself, and another $1500+ if a pro assembles it for you. If you want to to get to 100 hp with carbs, then big bore is the route you'll have to take, like a 1380cc, a very high level streetable 1380cc on carbs can get slighty over 100 hp.
Forced induction like the Moss supercharger can net impressive numbers as well, and can get to and over the 100 hp mark, but you've got the cost of the Moss supercharger to think about first, thats $3700 for starters, then there are other add-ons ,and you easily tie up $4000+ in what you need to do this. Ok so now you sprung for the Moss Supercharger engine, what sort of engine do you currently have, if you already have sprang for high compression engine using higher compression pistons and cut down head, already the supercharger is not going to work on that engine, forced induction require lower compression levels. The Moss supercharger was built with aprox 5-6 psi of boost, so it will work with say 8.8 to 1 engine, but not a 10.0 to 1 engine, and then if you want to look at the the higher boost pulley, now you are flirting with 10 pis of boost and really need to think about a forged 8.0 to 1 custom piston. Ok lets say you have factoy low comprsson engine now, if in good operating condition, then sure you can bolt the Moss supercharger on it, and go, but if you have a higher mileage low compression engine, forced induction will quickly tax your worn engine, so one fo the first things to consider wih forced induction is having a engine that suited to handle it, and if yuo need to rebuild to get there, you have to add that on top of the cost of the supercharger, hence the old saying, how fast do you want to go, and how much do you wan tot spend to get there.
The Moss supercharge ris the base for what dreams are made of though, I'm very thankful they took onthis project for the good of our hobby, because if you were to approach this in high level manner, you can have the same HP ratings as all out high compression race engine, but yet still drive ti down to the road to the grocery store, now doesn't that sound like fun
Forced induction like the Moss supercharger can net impressive numbers as well, and can get to and over the 100 hp mark, but you've got the cost of the Moss supercharger to think about first, thats $3700 for starters, then there are other add-ons ,and you easily tie up $4000+ in what you need to do this. Ok so now you sprung for the Moss Supercharger engine, what sort of engine do you currently have, if you already have sprang for high compression engine using higher compression pistons and cut down head, already the supercharger is not going to work on that engine, forced induction require lower compression levels. The Moss supercharger was built with aprox 5-6 psi of boost, so it will work with say 8.8 to 1 engine, but not a 10.0 to 1 engine, and then if you want to look at the the higher boost pulley, now you are flirting with 10 pis of boost and really need to think about a forged 8.0 to 1 custom piston. Ok lets say you have factoy low comprsson engine now, if in good operating condition, then sure you can bolt the Moss supercharger on it, and go, but if you have a higher mileage low compression engine, forced induction will quickly tax your worn engine, so one fo the first things to consider wih forced induction is having a engine that suited to handle it, and if yuo need to rebuild to get there, you have to add that on top of the cost of the supercharger, hence the old saying, how fast do you want to go, and how much do you wan tot spend to get there.
The Moss supercharge ris the base for what dreams are made of though, I'm very thankful they took onthis project for the good of our hobby, because if you were to approach this in high level manner, you can have the same HP ratings as all out high compression race engine, but yet still drive ti down to the road to the grocery store, now doesn't that sound like fun
Trevor Jessie
Yoda
Offline
Supercharger route is not cheap. I ran one on a 8.8:1 engine that had a more than a few miles on it. It gave a good performance boost and I got about 15,000 miles out of it before I decided to spend the cash and build an engine for the supercharger. Now I'm running 8.4:1 IIRC and the higher boost pulley. I think 9PSI is the highest I've ever seen on the gauge. It really depends on your head and cam configuration. I think I can eek out a few more HP by changing my rockers to 1.5, but truthfully the car is more than enough to for me to handle. My brother (a racer boy) has a really fast turbo/nitro assisted eclipse. I've taken him for a ride in my Sprite and heard him utter more than a few expletives. Is my car faster than his? Certainly not, but it corners much better and the sensation is very different. (His car is a convertible, but it doesn't feature the noise and commotion of my Sprite)
Hap Waldrop
Yoda
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It's all about money and what people want to spend it on. I had a customer I know on purpose built MGB S/C set up that when you factor in his S/C, his purpose built trick, as all get out, engine, his 5 speed gearbox, he probably has $15K in the entire set up, not counting the rest of the car, and that makes some people heads want to explode, but I got over this years ago, with racing, I've seen $90K racing Bugeyes, and $100K racing MGBs. I figure if people have that sort of cash to throw at a project, good for them, God bless America, they could go buy a Ferrari for that, but I impressed that think of enough of these little cars to sink serious cash in them, so the rest of us can drool at them.
This hobby is many things to many people, and these cars are cheap enough for lots of to play with them, and that's a good thing.
This hobby is many things to many people, and these cars are cheap enough for lots of to play with them, and that's a good thing.
