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914World.com _ 914World Garage _ OT: 90-100lbs of turbo boost!!
Posted by: Rand Jan 27 2006, 01:39 PM
Watching tractor pulls on ESPN2... The big alcohol-burning beasts are running three turbos, multistaged, pushing up to 100lbs of boost.
Posted by: Aaron Cox Jan 27 2006, 01:40 PM
top fuel dragsters are running like 70-90 i heard (supercharged)
Posted by: alpha434 Jan 27 2006, 01:48 PM
yeah. They just weld the heads on. You can do that with our little engines and run 25, easy.
Posted by: Aaron Cox Jan 27 2006, 01:50 PM
| QUOTE (alpha434 @ Jan 27 2006, 12:48 PM) |
| yeah. They just weld the heads on. You can do that with our little engines and run 25, easy. |
how do you weld aluminum (heads) to steel (cylinders)?
Posted by: alpha434 Jan 27 2006, 01:51 PM
get aluminum cylinders. Duh.
Posted by: Britain Smith Jan 27 2006, 03:55 PM
I wonder if Jake has ever tried that one?
-Britain
Posted by: Jake Raby Jan 27 2006, 04:04 PM
Nope...
Just do like a Lycoming and THREAD the heads onto the cylinders like a big pipe!
Posted by: stock93 Jan 27 2006, 04:20 PM
Check out varible geometry turbos. Some of them are in the neighborhood of 70 lbs of boost with a single turbo.
John
Posted by: Aaron Cox Jan 27 2006, 04:23 PM
| QUOTE (Jake Raby @ Jan 27 2006, 03:04 PM) |
| Nope... Just do like a Lycoming and THREAD the heads onto the cylinders like a big pipe! |
hard to do with finned cylinders no?
Posted by: Mueller Jan 27 2006, 04:32 PM
| QUOTE (Aaron Cox @ Jan 27 2006, 03:23 PM) | ||
hard to do with finned cylinders no? |
it would be easier if the cylinders are 2 piece...the cylinder screws into the head and the fins slide over the cylinders......sounds expensive
personally, I like the idea of the head and cylinder being one piece....harder to do a valve job, but doable and is currently offered as is for Type I light aircraft applications.....
Posted by: Aaron Cox Jan 27 2006, 04:39 PM
scat makes type 1/4 heads where they are individual heads....
slugmika had them on his bug
Posted by: Mueller Jan 27 2006, 04:41 PM
| QUOTE (Aaron Cox @ Jan 27 2006, 03:39 PM) |
| scat makes type 1/4 heads where they are individual heads.... slugmika had them on his bug |
yea, I was looking at those, Jake talked me out of it...way too much work I guess?!?!?!?
Posted by: Aaron Cox Jan 27 2006, 04:44 PM
| QUOTE (Mueller @ Jan 27 2006, 03:41 PM) | ||
yea, I was looking at those, Jake talked me out of it...way too much work I guess?!?!?!? |
but you could thread them into the cylinders
whats more work about them???
Posted by: airsix Jan 27 2006, 04:59 PM
When you turbo a typeIV all the boost goes past the rings.
Seal the rings and it goes out between the deck and heads.
Seal the heads and it goes out the valve guides.
And oil starts coming out of places that never leaked before.
...but its fun to drive. 
-Ben M.
Posted by: Porcharu Jan 27 2006, 05:55 PM
| QUOTE (Mueller @ Jan 27 2006, 02:32 PM) |
personally, I like the idea of the head and cylinder being one piece....harder to do a valve job, but doable and is currently offered as is for Type I light aircraft applications..... |
I was watching that too, I even thought about posting a WOT thread. They are converting heavy duty diesels to alcohol and then running compound turbo systems on them, mentioned going from a little under 200 HP to 4000HP!
Mike you need to look at an old OFFY they are made like that - that's why they were so succesfull as Indy car engines for so long. That's gotta be a PITA to do a valve job.
Posted by: airsix Jan 27 2006, 06:45 PM
| QUOTE (srbliss @ Jan 27 2006, 03:55 PM) |
| personally, I like the idea of the head and cylinder being one piece... That's gotta be a PITA to do a valve job. |
Compressing the rings and slipping all the pistons in is probably tricky too.
-Ben M.
Posted by: r_towle Jan 27 2006, 09:12 PM
| QUOTE (Mueller @ Jan 27 2006, 05:32 PM) | ||||
it would be easier if the cylinders are 2 piece...the cylinder screws into the head and the fins slide over the cylinders......sounds expensive personally, I like the idea of the head and cylinder being one piece....harder to do a valve job, but doable and is currently offered as is for Type I light aircraft applications..... |
no need for a cooling system on a 1/4 mile drag motor...
Look at pauter...he has some 1000hp motors...
They are a one shot deal...but if you win, its worth it I suppose...
Rich
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