鳳翎 wrote:
感謝分享
但是跟您說一下
引擎控制在極輕微爆震附近
是為了最高燃燒壓力
並非為了省油
這在內燃機教程的設計方面有提到
(恕刪)
有最合適燃燒壓力代表引擎效率高,所以也省油了,你要重新複習內燃機教程了.
https://link.springer.com/article/10.1007/s12544-013-0099-8
Chen gary wrote:
後來清潔過的看起來...(恕刪)
紅線的汽油精白皮書內有提到你的疑慮:
https://www.redlineoil.com/Content/files/tech/S1-1%20Tech%20Info.pdf
Many refiners are not willing treat all their fuel with high
temperature detergents to clean dirty injectors, but
instead use larger doses of less costly carburetor detergents, which can partially clean simple cases, but the
poor stability of these detergents cause another, equally
serious problem - they break down and form deposits
on valves, causing a restriction of intake air and poor
driveability. Many other fuel additives try to achieve
cleanup using solvents which can clean in a very
concentrated form, but provide very little effectiveness
when diluted in a fuel tank. Solvents have the potential
drawback of causing swelling and degradation of seals
and hoses in the fuel system. Red Line SI-1 uses
surface active chemistry which cleans effectively and
safely.
我不願意再把引擎的扭力或馬力改更大的原因是:
1. DQ250 扭力超過 46 kg-m 就開始有打滑的風險,需要加大壓力,或是改裝離合器片來改善,前者會縮短電磁閥壽命,後者費用不便宜
2. 當引擎扭力輸出高於 50kg-m, 常常用一檔全油門,大約 4萬公里內,就有案例 Bevel Box 崩齒,之後變成前驅車.
基於以上兩個原因,我不願意把引擎改更猛.
就算一階把中冷換掉,通常體積變更大, turbo lag 也會變嚴重一點(大部分的人是說不明顯),但既然 ECU軟體上已經夠保守,也沒必要再把進氣溫度搞更低.
我要的只是全部用原廠硬體,沒壞換了也浪費,然後把原廠 ECU可以相容 95無鉛汽油的寬容性,拿來換性能,但希望硬體都不改的前提下,仍有足夠長的使用壽命,自己在做一點調整來延長壽命...這才是我要的
Chen gary wrote:
其實我也常用紅線汽...(恕刪)
用 3M 泡沫積碳清除劑後,我會低速,底轉速行駛幾百公尺後,把機油換掉,就是怕機油受到影響.
紅線汽油精或是汽油精,2005年時故意安排在 4500 km 時加半罐到一罐,一桶油跑完,馬上換機油,減少被汙染的機油減少被汙染的機油使用的時間,但後來發現這樣清潔效果可能不夠好,而向 STP汽油精,使用時會覺得引擎沒麼滑,用 VW, AUDI 的汽油精很濃,反而卻比較滑,紅線也有類似的功能:
Contains synthetic upper cylinder lubricant
我想這個是功能有這樣的差異.
而白皮書內的使用濃度建議:
USE DIRECTIONS
Initially use one bottle to a fuel tank and fill with fuel
to achieve rapid cleanup. The treatment can be
reduced on subsequent fillups to 1/3-1/6 oz per
gallon (one bottle to 50-100 gallons) to provide
continual injector and valve cleanliness. The detergents and antioxidants help prevent the formation of
gum and varnish in gasoline, and the rust inhibitors
prevent corrosion. Red Line SI-1 will not damage fuel
system components and the combustion by-products
do not cause corrosion of engine bearings as can
many fuel additives. Red Line SI-1 is available in 15
ounce bottles, 5 gallon pails, and 55 gallon drums.
Similar chemistry is available in a 6 ounce, less
concentrated version called SI-2 Injector & Valve
Detergent.
這濃度其實很低,原本的汽油也有加添加劑,難道就一定對潤滑沒影響嗎? 我覺得很難說,我是選擇相信 red line 這種大廠公開的資料.
況且,就算真的對機油有影響,我加濃了. 5W40 HTHS 大約在 4.2 ,遠高於原廠要求的 3.5,就算有些微稀釋,也還好,而且使用里程已經降到原廠建議的 1/3 了....
當然, HTHS 要求,有一部分的原因是增加了增壓值,當汽缸每次爆發,施加在曲軸波斯上的壓力,從潤滑理論上來看,是需要更厚的油膜來保護的:
https://www.stle.org/images/pdf/STLE_ORG/BOK/LS/Grease/Selecting%20the%20Correct%20Lubricant%20for%20Plain%20Bearings_tlt%20article_Sept08.pdf
上圖可以知道 W 變大,油膜需要加厚,不然就是曲軸波斯部位需要加大半徑或寬度( 上圖的 l 或 d)
改造引擎內部比竟是貴,我選擇加濃一級來彌補一下...同時爬山時油溫到 110度時,我也比較不會這麼擔心
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