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Most HP ever from a n/a L4 Nissan L20b


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#1 Mrfixit

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Posted 29 November 2010 - 01:13 AM

Hi guys

What is the most horsepower ( engine dynoed)you have heard of being made by a naturally aspirated L20b Nissan L4.

#2 INDY510

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Posted 29 November 2010 - 01:20 AM

.
126hp

#3 69FJWagon

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Posted 29 November 2010 - 06:24 AM

Troy just built a L20b (2050cc per the rules for the class) 10.1 compression on pump gas with 44mm Mikunis and it made almost 145hp at the wheels I am not sure if Troy or the owner kept the dyno sheet but I was there and watched the dyno myself
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#4 merlin

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Posted 29 November 2010 - 06:35 AM

I believe Specialty Engineering has built a couple of 160+ Hp NA L20B's... i know they did a 210 hp turbo .... Andy is the mad scientist of Datsun engines
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#5 datzenmike

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Posted 29 November 2010 - 07:05 AM

Keith Law's turbo L20B is 249 hp Merlin.


Hi guys

What is the most horsepower ( engine dynoed)you have heard of being made by a naturally aspirated L20b Nissan L4.



The thing is ...A motor built to this is undriveable on the street. You would need much taller gears to keep it revved up where it makes enough power to actually move the car. Keith Law as mentioned above runs 4.625 rear differential and aviation fuel NOT CHEAP. The car is great out on the highway and with the gears drivable in town but not recommended. Other drive line parts have been replaced or modified to withstand the power. Even NA some of this must be taken into account.

Try a larger motor like a KA. Makes at least as much as a full bore L20B would, and it's reliable, EFI, loads of torque.

#6 Braden

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Posted 29 November 2010 - 07:13 AM

GO ON YOU TUBE TYPE IN DATSUN L18 DYNO DAY, NA L18 IN A BRE 510 MADE LIKE 180HP TO THE WHEELS, ALL ABOVE 6000RPM. THROW A CAM IN IT, THROW ON SOME DUAL CARBS, CALL IT GOOD!!!!!
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#7 DISLEXICDIME

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Posted 29 November 2010 - 08:49 AM

GO ON YOU TUBE TYPE IN DATSUN L18 DYNO DAY, NA L18 IN A BRE 510 MADE LIKE 180HP TO THE WHEELS, ALL ABOVE 6000RPM. THROW A CAM IN IT, THROW ON SOME DUAL CARBS, CALL IT GOOD!!!!!


once you get l in this horse power range it is not fun to drive in stop and go traffic. on the free way it is fun though !

braden's hainz quote is right!
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#8 Mrfixit

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Posted 29 November 2010 - 05:33 PM

So in a full race engine 250hp is not possible

#9 69FJWagon

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Posted 29 November 2010 - 07:39 PM

So in a full race engine 250hp is not possible

full race??? like what are you talkin about...

the full race L20b in Troys old 710 race car made almost 200 at the wheels but thats 12.1 compression aftermarket rods and pistons and 50mm carbs and is NOT streetable... are you building a race car or something to drive on the streets on the weekends
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#10 Mrfixit

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Posted 29 November 2010 - 09:11 PM

I saw on a facebook page where a guy was building a l20b with full billet segregated dry sump sump , crank trigged ,DLC coated camshaft and lifters race engine and was claiming at least 250hp . I haven't heard of anyone making that

#11 DISLEXICDIME

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Posted 29 November 2010 - 09:43 PM

I saw on a facebook page where a guy was building a l20b with full billet segregated dry sump sump , crank trigged ,DLC coated camshaft and lifters race engine and was claiming at least 250hp . I haven't heard of anyone making that


he must have a lot of money
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#12 Mrfixit

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Posted 30 November 2010 - 01:38 AM

Possibly. They own a full cnc machine shop

#13 Mrfixit

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Posted 30 November 2010 - 02:00 AM

Here's pics of the cnc ported head
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#14 Mrfixit

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Posted 30 November 2010 - 02:11 AM

Start of there CAD model for billet dry sump pan
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#15 AtomChurch

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Posted 30 November 2010 - 02:19 AM

Wow. I want a full machine shop!
Built not bought.
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#16 hang_510

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Posted 04 December 2010 - 01:37 AM

I saw on a facebook page


race engine and was claiming at least 250hp . I haven't heard of anyone making that

:rolleyes:


on paper HP.
whens it gonna be assembled?


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I'll put on chain mail and a dirt bike tire jock strap and drive it!!!!!


#17 Mrfixit

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Posted 09 December 2010 - 03:02 AM

Should be finished before Xmas and engine dynoed in the new year .

#18 510kevin

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Posted 09 December 2010 - 12:51 PM

does anyone run nitrous on l motors for quick hp? just wondering how it would respond to nitrous good or bad. i have a nos setup here that ive been thinking about running with 50 shot jets, but im curious to see if anyone here has ran it....

#19 erikcarter

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Posted 13 December 2010 - 09:33 AM

Dan Hard of Circle h Racing here in vancouver has done it before and told me that it was pretty easy and the main things were to make sure you have a switch under the gas peddle to make sure you are at full throdle and you cannot hit the nos in first gear, the motor will rev up too quick.
anything with a motor will give me trouble!

#20 nrbill

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Posted 13 November 2011 - 09:20 PM

The most powerful L-20B I knew of was one built by Frank Honsowetz in the early 90's. It put out 215 HP with the power band starting at 6000. It has the later FIA cylinder head and the twin 50mm Solexes. It's still around, but hasn't run in about 15 years. No nitrous, nitro, alcohol, or other BS, just race gas like everybody else was using at the time.