# Engines: Cost and weight per HP

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#### Marc W

##### Well-Known Member
Marc, is that the installation on your Thatcher CX4? My Sonex is setup the same way (I think most Sonexes are like this, though those who have fitted the turbo had to move the cooler to the top of the engine, as it is done on the Onex). It works well, and keeps the air duct and oil lines short. It does make changing the oil a bit of a bother since the oil cooler has to be moved to remove the cover and screen installed on the bottom of the oil pan.
Yes, it is on the CX4. You are right about changing oil. I have to remove the airbox and unbolt the cooler to get to the drain plug and screen. There are just 4 bolts holding the cooler and it hangs on the hoses so it isn't to bad.

#### Vigilant1

##### Well-Known Member
A cleaned-up and revised edition of the chart. Thanks, narfi, for the chart configuration tip.
Changes:
- Modified the 1/2 VW engines to reflect the price of a new case (previous chart used the price for use of a reconditioned case). This is more consistent with other entries inthe chart (except the Corvair). A new case adds $700 to the price of the 1/2VW Observations: - A hand-propped 1/2 VW (37 HP) costs the same as a hand-propped 4 cyl 1835cc VW (60 HP). As Pops has said, the hand-propped 1835cc VW gives a lot of bang-for-the-buck. But, if you need a 37HP to 45HP 4-stroke engine of less than 100 pounds, whatchagunnado? - In the bang-for-the-buck category, the math indicates Hummell/Casler 2400 engine to be a pretty good bargain, especially as it includes dual ignition, electrical system, starter, etc.  Engine HP Cost($) Weight (lbs) $per HP Lb per HP Notes Lycoming O-360 180 27,500 305 153 1.69 1 Continental O-200A 100 23,500 205 235 2.05 Rotax 912 ULS/S 100 19,437 125 194 1.25 Aeromomentum AM13 100 10,495 201 105 2.01 2,3 Corvair 100HP 100 10,500 219 105 2.19 4 VW 2331cc Revmaster 85 (80) 9,400 170 111 2.00 5 VW 2387ccHummel "2400" 85 (?) 7,275 170 86 2.00 6 VW 2180cc 76 7,175 167 94 2.20 6 VW 1835cc 60 6,025 165 100 2.75 7 VW 1835cc 'basic' 60 4,750 145 80 2.42 8 1/2 VW (1037cc) 37 5,775 100 156 2.70 6 1/2 VW (1037cc) "basic" 37 4,750 85 99 2.00 8 Briggs&Stratton 810cc 30 830 87 28 2.90 9 " " + hub&bearing 30 980 94 33 3.13 10 Harbor Freight 670cc 22 730 97 33 4.41 9 " ^6 + hub&bearing 22 880 104 40 4.73 10 Notes (1) Price through Van's direct purchase program. May be higher elsewhere? (2) Price is for the Aeromomentum AM13 "low profile" version. The upright version is$8495
(3) Weight is for the AM13 engine, radiator, and coolant
(4) Azalea Aviation "Spyder." 120 HP also available, ($12,900) (5) Revmaster "R2300." 85HP max, 80HP continuous. 94mm bore, 84mm stroke (6) From Hummel engine site, includes dual ignition system, starter, alternator, carb, Force One bearing and prop hub (7) As above, but simple shrink fit prop hub (no Force One bearing and hub) (8) Hummel engine site: Single ignition, hand propped, no alternator, with carb (9) Twin. Includes factory flywheel (incorporates factory stator/generator and ignition trigger, etc) (10) Estimated future price and weight of additional bearing and prop hub:$150, 7 lbs.[/QUOTE]

#### Vigilant1

##### Well-Known Member
- Are there other industrial engines we should add?
-- That B&S 540cc vertical single (of 19 or 21 HP)? Is removing the 6 lb balancer and turning it horizontal really practical, or will it shake itself/an airplane to atoms? $559/19HP = 29.42, slightly higher than the B&S 810cc twin. - Any 4-stroke cart engines/small vehicle engines available as crate engines? #### rv7charlie ##### Well-Known Member #### BBerson ##### Light Plane Philosopher HBA Supporter - Are there other industrial engines we should add? -- That B&S 540cc vertical single (of 19 or 21 HP)? Is removing the 6 lb balancer and turning it horizontal really practical, or will it shake itself/an airplane to atoms?$559/19HP = 29.42, slightly higher than the B&S 810cc twin.
- Any 4-stroke cart engines/small vehicle engines available as crate engines?
Without the balance it might be same as older single cylinder Briggs. It is just the cheapest. Two could be connected for 1080cc. at around $1000. Probably easier to get the Robin/Generac ($2000) if they still make them. Those could be the remaining stock on hand. I heard they were discontinued. But changes hands frequently.

#### pictsidhe

##### Well-Known Member
It would be possible to belt or chain drive an external balancer to just about any engine. This would be the easiest way to make an excessively vibey unbalanced engine usable.

#### Lucrum

##### Well-Known Member
Log Member

Just for comparison and using published numbers for the unmodified version of my engine. (Mine is modified)

Engine

GE T-58-8B

HP

1325 for 5 mins

Cost

$26,000 or so Weight 270 lbs$ per HP

#### Norman

##### Well-Known Member
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Yours for just under $5k Sorry forgot to put the cost in the last post:$4,495 + 200 shipping. It's not mine. I'm just the help :dis:

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