Four valves per cylinder engine head

Inactive Publication Date: 2005-09-29
ARAO MASACHIKA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] The design of the present invention accomplishes the desired use of greater flow yielding four valves at angles allowing the spark plug location and combustion chamber to be advantageous and highly superior to the prior art.
[0014] Another object of the invention leads to higher engine speeds and greater power while using the standard intake and exhaust systems.

Problems solved by technology

While this approach is basically acceptable, there are some inefficiencies, such as restricted flow areas through valve ports which limit power at high engine speeds.
Further, the position of the spark plug is not in the optimum l

Method used

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  • Four valves per cylinder engine head
  • Four valves per cylinder engine head
  • Four valves per cylinder engine head

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Embodiment Construction

[0020] The best mode for carrying out the invention is presented in terms of a preferred embodiment and is illustrated in FIGS. 1 thru 3. The invention is limited is limited to a head assembly 20 for a gasoline engine having an internal cam shaft and plush rod system, specifically the Harley Davidson engine and copies thereof. The head 20 has a pair of exhaust valve ports 22 with seats 24 and a pair of intake valve ports 26 also with seats 28. The seats are alternatively formed with bushings, as depicted in FIG. 1.

[0021] The head 20 further contains a plurality of push rod passages 30 in linear alignment with the hydraulic valve lifters (not shown) one passage 30 for each pair of valves. Further, a threaded hole 32 for the spark plug is centrally located between the valves in the general area the ports 22 and 26 with the hole 32 recessed and the area thereunder forming a combustion chamber 34.

[0022] A pair of exhaust valves 36 are transversely parallel but are disposed at 25 to 35...

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PUM

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Abstract

An improved head assembly replacement for the Harley Davidson Motorcycle engine 20 adapted to utilize four valves per cylinder using push rods 50 without modification to the engine block, and maintaining the existing location and configuration for the mounting of the normal intake and exhaust systems. The standard rocker arms actuate the new dual intake and exhaust valves through a yoke 54 bridging each pair of valves. The exhaust valve and intake valve pairs are inclined at an included angle of 50 to 70 degrees in the plane of the engine crankshaft. The pushrods 50 remain in the standard position and the self-adjusting hydraulic tappets are retained.

Description

TECHNICAL FIELD [0001] The present invention relates to heads for gasoline internal combustion engines in general and more specifically to head conversions having four valves per cylinder with the spark plug centered between the valves and push rods communicating directly with rocker arms actuating the valves. BACKGROUND ART [0002] Previously, attempts have been made in engine modifications replacing the head with a retrofit that utilizes the existing camshaft driving pushrods, rocker arms and four valves, which are arranged in the classic “V” form of the intake and exhaust valves. In the past, for motorcycle engines having two cylinders set at a “V” have typically used, for this conversion, rockers arms having two fingers actuating each valve. This necessitates the periodic adjustment for the proper operating clearance of the space between each valve and rocker arm finger. Diesel engines with four valves per cylinder, commonly use a rocker arm having a single finger, which actuates...

Claims

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Application Information

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IPC IPC(8): F01L1/18F01L1/26
CPCF01L1/146F01L2820/01F01L1/262F01L1/181
Inventor ARAO, MASACHIKA
Owner ARAO MASACHIKA
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