The actual term redline comes from the red bars that are displayed on tachometers in cars starting at the rpm that denotes the redline for the specific engine. Regulations in 2010 limit the maximum engine rotation to 18000 rpm, but during the 2006 season, engine speeds reached over 20000 rpm on the Cosworth engine. (Though due to regulations in Japanese motorcycle manufacturing this was later lowered to 18,000) Higher yet is the redline of a modern Formula One car. For example, the Honda CBR250RR has a redline of about 19,000 rpm. Motorcycle engines can have even higher redlines because of their comparatively lower reciprocating mass. For example, a Supercharged Buick 3800 V6 with a redline anywhere from 5500-6000 has a torque curve that peaks at 2600-3600rpms, yet the engine is a strong performer from takeoff all the way through to the redline.
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Lower redlines, however, do not necessarily mean low performance, as some skeptics sometimes assume. Overhead cam engines eliminate many of the components, and moving mass, used on OHV engines. After the valve opens, the valve spring does not have enough force to push the mass of the rocker arm, push rod, and lifter down on the cam before the next combustion cycle. At high speeds, the valve spring simply cannot keep the tappet or roller on the camshaft. One main reason OHV engines have lower redlines is valve float. In contrast, some older OHV engines had redlines as low as 4800 rpm, mostly due to the engines being designed and built for low-end power and economy during the late 1960s all the way to the early 1990s. The Renesis in the current Mazda RX-8 has the highest redline of a production rotary-engine road car rated at 9400 rpm. The Ariel Atom 500 has the highest redline of a piston-engine road car rated at 10,600. Gasoline automobile engines typically will have a redline at around 5500 to 7000 rpm. Diesel engines normally have lower redlines than comparatively-sized gasoline engines, largely because of fuel-atomization limitations. Redlines vary anywhere from a few hundred revolutions per minute (rpm) (in very large engines such as those in trains and generators) to more than ten thousand rpm (in smaller, usually high-performance engines such as motorcycles and sports cars with pistonless rotary engines). Lighter components can increase the redline as well, since they have less inertia and decrease forces present in the engine.
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Comparison of ATR requirements with QM origination requirements.
#Redline definition Patch#
Unofficial redline of the Patch Extension Final Rule’s amendments to the ATR/QM Ruleįactsheet on prepaid interest and the General QM APR special rule for adjustable rate mortgages Coverage charts Unofficial redline of the General QM Final Rule’s and Seasoned QM Final Rule’s amendments to the ATR/QM Rule Unofficial redline of the final rule extending the mandatory compliance date of the General QM final rule Supplement I to Part 1026 (including official interpretations for the above provision)Įxecutive summary of the final rule extending the mandatory compliance date of the General QM final ruleĮxecutive summary of the December 2020 amendments to the ATR/QM RuleĮxecutive summary of the October 2020 amendments Other references.Appendix Q to Part 1026-Standards for determining monthly debt and income.§ 1026.43(f), Balloon-payment qualified mortgages made by certain creditors.§ 1026.43(d), Refinancing of non-standard mortgages.Main ATR/QM rule provisions and official interpretations can be found in: Regulations and official interpretationsīrowse Regulation Z (12 CFR1026) on: Interactive Bureau Regulations | eCFR Browse the ATR/QM rules to see specific amendments made by each final rule to Regulation Z.