關於 ohc sohc ，我們在網路上蒐集到這些相關的討論、資訊與評價

［馬里的科學實驗室］頂置凸輪軸（OHC）！
引擎的凸輪軸安裝位置有下置、中置、頂置三種形式，轎車引擎由於轉速較快，每分鐘轉速可達5000轉以上，為保證進排氣效率，都採用進氣門和排氣門倒掛的形式，即頂置式氣門裝置，這種裝置能夠適用於凸輪軸的三種安裝形式，但是，假如採用下置式或者中置式的凸輪軸，由於氣門與凸輪軸的距離較遠，需要氣門挺桿和挺柱等輔助零件，造成氣門傳動機件較多，結構複雜，引擎體積大，而且在高速運轉下還輕易產生噪聲，而採用頂置式凸輪軸則可以改變這種噪音現象。所以，現代轎車引擎一般都採用了頂置式凸輪軸，將凸輪軸配置在發動機的上方，縮短了凸輪軸與氣門之間的距離，省略了氣門的挺桿和挺柱，簡化了凸輪軸到氣門之間的傳動機構，將引擎的結構變得更加緊湊，更重要的是，這種安裝方式可以減少整個系統往復運動的質量，提高了傳動效率，按凸輪軸數目的多少，可分為單頂置凸輪軸（SOHC）和雙頂置凸輪軸（DOHC）兩種，由於中高檔轎車引擎一般是多氣門及V型氣缸排列，需採用雙凸輪軸分別控制進排氣門，因此雙頂置凸輪軸被不少名引擎使用！
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#馬里的科學實驗室 #OHC

Hip up coupe「ザ・ヒップアップクーペ」1970-1978

旧車イベント告知 旧車イベント開催情報サイト　千石峡秘密基地
全国の旧車イベント開催情報はこちら↓をクリックしてください。
https://proofficekei.wixsite.com/sengokukyo


Music by Casey Cook - Blue - https://thmatc.co/?l=A83BFB4E


歴史（1970年-1978年）A53C/A55C/A57C型
1969年秋 - ギャランクーペGTX-1の名で東京モーターショーに出展される。
1970年10月 - コルトギャランGTOの名前で発表および発売。イメージリーダー的グレードの「MR」は同年12月発売。当初は全てOHCヘッドを用いたサターンエンジン（4G32型エンジン）を搭載していた。内、「MR」に限りDOHCヘッド化されたエンジン（4G32型）を搭載。メッキグリルと黒いライトベゼルが前期顔である。テールランプは赤一色の角型４灯で、テールウインカーはブレーキ／テールランプ共用となっているのが初期型の特徴。テールは４灯同時に点灯、ウインカー作動時は片側２灯ずつ点滅する。
1972年2月 - 排気量を100ccアップしたエンジン（4G35型SOHCエンジン）を搭載した17Xシリーズとなり、AT車を追加。これに伴い「MR」を除き1,600ccの4G32型SOHCエンジン搭載車が廃止。テールデザインは変わっていないが、赤４灯だったテールの内側２灯がウインカーとして割り振られ、レンズがオレンジ色になった。テール／ブレーキ共用だったテールウインカーは現在の車と同じ独立した点灯方式になっている（これによって４灯だったテール／ブレーキは外側２灯のみ点灯となる）。
8月 - 昭和48年排出ガス規制により「MR」廃止。高価なMRは835台生産と少数に留まる。
1973年
1月 - マイナーチェンジ。フロントグリル、テールランプの意匠変更。テールは角形４灯からひらがなの「く」型を基調としたデザインになっている。デザイン変更により、独立したウインカーを配置した上で再びテール／ブレーキランプが４灯になっている。「1700SL」以外、2,000ccのアストロンエンジン（4G52型SOHCエンジン）へ移行する。トップグレードの「GS-R」はMRと同じ125馬力。
10月 - 一部改良（安全対策）。
1974年8月 - 保安基準改正によりオーバーフェンダ装着車である「GS-R」廃止。
1975年
2月 - 2度目のマイナーチェンジ（仕様変更・安全対策）。3速AT車が廃止。2,000ccはサイレントシャフトが搭載されたアストロン80エンジン（4G52型エンジン）に変更。馬力変更は無し。GS-Rは高速走行時に車体を安定させる効果のあるエアダムスカートを装着。
10月 - 一部変更。昭和51年排出ガス規制適合により全車パワーダウンを余儀なくされる。「1700SL」が4速MTから5速MTに変更され、「1700SL-5」に改称。事実上、トランスミッションが全車、5速MTに統一となる。
1976年
5月 - 一部変更（仕様変更・安全対策・最終型）。自動車保安基準改正による安全対策の強化のため前後バンパーの側面部分に黒色塩ビ樹脂製のサイドプロテクターが標準で装着される。これに伴いグレードが整理され、需要不振を理由に「2000GS-5」のみカタログ落ちとなる。
1977年7月 - 昭和53年排出ガス規制に適合出来ず生産終了。以後、流通在庫分のみの販売となる。
1978年3月 - 販売終了。日本国内における総生産・販売台数は95,720台だった。　実質的な後継車は三菱・ギャランΛとなる。なお、後のGTOはスタリオンの系譜である。


＃ギャランGTO　＃ギャラン

1969 HONDA DREAM CB750FOUR K0　1969 ホンダ・ドリームCB750　K0　　

://jp.youtube.com/watch?v=Trn7-SD6fCQ

レストア完成、
おめでとう、

HONDA and DREAM CB750FOUR (Doremushebe ..floatage.. Foix) are motorcycles to which Honda Motor Co., Ltd. was doing the manufacturing sales.
Details until developing

At first, the reputation in foreign countries was not fragrant though HONDA that accomplished complete conquest by the road racing world championship at that time aimed to advance worldwide on a commercial side, and announced and had exported the new car of dream CB450 etc. one after another except the desire. It is because there was respect that lacks from a room that the rider can manipulate even if the performance is put out by a small displacement little to easiness to get on because this values a top speed of the motorcycle as a flow from the race.

Then, all technologies at that time will be concentrated on manufacturing as a motorcycle at that time because it becomes a maximum level displacement though the vehicle that can correspond also to a recent race standard after coexisting of the performance and room is attempted because of the expansion of the displacement is planned and production was decided.

The vehicle manufactured thus is dream CB750FOUR (henceforth CB). The dream of the car name is a series trademark that HONDA was using for the efficient at that time, sports type.
The main equipment and performance of CB

Engine Parallel four cycle four cylinders OHC
The cylinder is narrowed a little by using a lot of parts of aluminum and width and the weight of the engine are suppressed though the engine adopted four parallel cylinder engine of two-wheel mass production first car considering externals. About the Shaiki valve, not DOHC but easiness to get on and productivity for the high rotation used from the low rotation were considered to a racer at that time, and ..daring.. SOHC was adopted. As two-wheel mass production car, it is the first time to have equipped four cylinders all with the carburetor.
Engine performance- 738cc･67 horsepower and maximum speed 200 km/h
The displacement and the horsepower of the engine were decided in shape to compare engines of this industry and others car. The performance that it is possible that it put on the speed at 200 km/h was still secured though it was suppressed from the priority of easiness to get on to the output extent more than the highest all motorcycles on the market, at that time, value though it was also possible that this engine raised the performance a little more. However, this is called the purpose is for the parts supplier to clarify the responsibility to the manufacturing thing to HONDA though parts only for CB will be both made as for a tire at that time and the chain because it is not possible to finish corresponding to this horsepower, and the explosion and the plasmotomy were repeated while developing.
Front wheel disk brake
The manufacturer named the MV Agusta had already used a small amount of front wheel disk brake in the production vehicle. However, it has been decided to make it equip with the disk brake by "Authoritative word" of Soichiro Honda who is finally the president and exhibit though the comparison discussion was done which the drum or the disk to be used just before Motor Show to which a real car of CB is exhibited because it was unexampled in two-wheel mass production car. As a result, it is told that it had a hard time in the accumulation of knowhow though the disk brake will be adopted for the first time as two-wheel mass production car. It is true that working of the brake worsens extremely when the rain running.

1969 HONDA DREAM CB750FOUR K0　1969 ホンダ・ドリームCB750　K0　　

://jp.youtube.com/watch?v=Trn7-SD6fCQ

レストア完成、
おめでとう、

HONDA and DREAM CB750FOUR (Doremushebe ..floatage.. Foix) are motorcycles to which Honda Motor Co., Ltd. was doing the manufacturing sales.
Details until developing

At first, the reputation in foreign countries was not fragrant though HONDA that accomplished complete conquest by the road racing world championship at that time aimed to advance worldwide on a commercial side, and announced and had exported the new car of dream CB450 etc. one after another except the desire. It is because there was respect that lacks from a room that the rider can manipulate even if the performance is put out by a small displacement little to easiness to get on because this values a top speed of the motorcycle as a flow from the race.

Then, all technologies at that time will be concentrated on manufacturing as a motorcycle at that time because it becomes a maximum level displacement though the vehicle that can correspond also to a recent race standard after coexisting of the performance and room is attempted because of the expansion of the displacement is planned and production was decided.

The vehicle manufactured thus is dream CB750FOUR (henceforth CB). The dream of the car name is a series trademark that HONDA was using for the efficient at that time, sports type.
The main equipment and performance of CB

Engine Parallel four cycle four cylinders OHC
The cylinder is narrowed a little by using a lot of parts of aluminum and width and the weight of the engine are suppressed though the engine adopted four parallel cylinder engine of two-wheel mass production first car considering externals. About the Shaiki valve, not DOHC but easiness to get on and productivity for the high rotation used from the low rotation were considered to a racer at that time, and ..daring.. SOHC was adopted. As two-wheel mass production car, it is the first time to have equipped four cylinders all with the carburetor.
Engine performance- 738cc･67 horsepower and maximum speed 200 km/h
The displacement and the horsepower of the engine were decided in shape to compare engines of this industry and others car. The performance that it is possible that it put on the speed at 200 km/h was still secured though it was suppressed from the priority of easiness to get on to the output extent more than the highest all motorcycles on the market, at that time, value though it was also possible that this engine raised the performance a little more. However, this is called the purpose is for the parts supplier to clarify the responsibility to the manufacturing thing to HONDA though parts only for CB will be both made as for a tire at that time and the chain because it is not possible to finish corresponding to this horsepower, and the explosion and the plasmotomy were repeated while developing.
Front wheel disk brake
The manufacturer named the MV Agusta had already used a small amount of front wheel disk brake in the production vehicle. However, it has been decided to make it equip with the disk brake by "Authoritative word" of Soichiro Honda who is finally the president and exhibit though the comparison discussion was done which the drum or the disk to be used just before Motor Show to which a real car of CB is exhibited because it was unexampled in two-wheel mass production car. As a result, it is told that it had a hard time in the accumulation of knowhow though the disk brake will be adopted for the first time as two-wheel mass production car. It is true that working of the brake worsens extremely when the rain running.