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470 anglevalve or 520
- Thread starter gat2013
- Start date
blackpowderscout
Well-known member
I had a 470 angle valve and now I have a 520. There is a noticeable difference in the performance between the two but the 470 was a great motor!!! I had it on a 13'6 cottonmouth and it would go dang near anywhere. It didn't burn as much fuel as my 520 now either. I prefer the 520 just because of the extra power but I would say if you can get your hands on a good angle valve 470 cheaper than the 520 to go for it.
You can do lots of things to bump up the HP. Contact JC Stanley..he's the Continental guru from what I understand. Do a search and you should be able to find his #, I don't have it right off-hand.
Adam
You can do lots of things to bump up the HP. Contact JC Stanley..he's the Continental guru from what I understand. Do a search and you should be able to find his #, I don't have it right off-hand.
Adam
goldhunter_2
Well-known member
what is the different though I was thinking it is just the bore/piston size is bigger on the 470 allowing more cubic displacement is that assumption correct :?:
A
Anonymous
Guest
That is correct. You can make a 470 into a 520 by changing the jugs, but first you must bore out the holes in the case on the 470
You will definitely get more power out of the 520 (torque), but a 470 is no slouch. It will probably give you better fuel economy than the 520 also, though niether will be spectacular
Remember that the HP ratings on aircraft engines is just that: a rating. It does not mean that every engine has that much power, and just because someone says a particular modification will give you "x more horsepower" doesn't mean that you are going to get that much if you do that mod on your engine.
You might want to look more at what size prop the MFG's suggest for each engine and decide if it is worth the money to you to go with the larger engine, rather than just basing off of HP ratings.
You will definitely get more power out of the 520 (torque), but a 470 is no slouch. It will probably give you better fuel economy than the 520 also, though niether will be spectacular
Remember that the HP ratings on aircraft engines is just that: a rating. It does not mean that every engine has that much power, and just because someone says a particular modification will give you "x more horsepower" doesn't mean that you are going to get that much if you do that mod on your engine.
You might want to look more at what size prop the MFG's suggest for each engine and decide if it is worth the money to you to go with the larger engine, rather than just basing off of HP ratings.
Country_Boy_85
Well-known member
I'm getting ready to do a conversion on my blown 220- just out of curiosity, but what kind of hp would i be looking at reaching if i did 470 jugs with dome pistons and a 520 cam and push rods?
Another question- if I'm going to go through the trouble of getting a 520 cam and push rods, would it be more practical (bang for the buck) just to do a full 520 conversion?
I'll be running a 72'' 2 blade Q series, and I'm worried that I'll be under-propped with the hp I'd be generating at the 520 level.
Any input is appreciated.
Another question- if I'm going to go through the trouble of getting a 520 cam and push rods, would it be more practical (bang for the buck) just to do a full 520 conversion?
I'll be running a 72'' 2 blade Q series, and I'm worried that I'll be under-propped with the hp I'd be generating at the 520 level.
Any input is appreciated.
A
Anonymous
Guest
Q series is very sensitive to changes in pitch (I found that out quick). You can actually pitch them past 3 (to about 3.5 or so). I'd try more pitch first, and see.
If that isn't satisfactory, add a blade. All you need is another blade and a hub, and 3 blade 72" should be plenty of prop.
If that isn't satisfactory, add a blade. All you need is another blade and a hub, and 3 blade 72" should be plenty of prop.
blackpowderscout
Well-known member
Country_Boy_85":1hngzvgr said:
I'm running a 72" 2 blade Signature on my 520...you won't be under-propped length wise. Not enough to be hating life, anyhow. Would a 74" be better??? Probably. But if a 72" is all you got, you'll be fine. I've never run a "Q" series though......
Adam
Country_Boy_85
Well-known member
That's definitely good news to hear on that prop. Its amazing the sound difference running the Q series makes. I talked to a rep and he said that the decibels are the same as any other prop (obviously excluding warp drive), its just a different pitch its creating, making it sound quieter.
- i was told that I'd be pushing somewhere in the 270-ish range on hp- does that sound about right for that set up?
- i was told that I'd be pushing somewhere in the 270-ish range on hp- does that sound about right for that set up?
blackpowderscout
Well-known member
If you do what you said in your previous post, then yes that sounds about right. Have fun!!
Adam
Adam
Country_Boy_85
Well-known member
is that a 2 blade or a 3 blade that yall are running?
A
Anonymous
Guest
They are running 2 blade Q's and let me tell ya, they will run! These guys led me across several miles of dry, and we were FLYIN!
Good times :twisted:
Good times :twisted:
Country_Boy_85
Well-known member
that's what everyone seems to say about that prop. great news to hear- thanks for all of the input! hopefully i'll get to see yall on the lake in the near future