aftermarket cam or turbo for l20b

[the carshop]

ok so right now i have a 76 620 with l20b, and i wanna see how much power i can pull outta this motor, if i can't get much more then I'm just going to swap out. so i have 2 questions.

 

1. does any company make a bigger cam i can put in if so is there a valve train anyone recommends?

 

 

2. is there a turbo for these?

 

 

so far Im about to put in a weber 40 i got a holly electric fuel pump but i don't really expect to get much outta that.

[ggzilla]

Just about every cam company will make a larger camshaft. But your low-RPM power will drop. Just call your favorite cam company and special order a cam for the L20B, tell them the RPM range you want it to work at. The stock cam seems like a 2000-5000 RPM powerband. For better airflow, use the stock large L20B carburetor instead of a weber 32/36. Well actually you should move up to 40mm or 44mm sidedrafts if you want significantly more power.

 

No one makes a turbo kit right now. But you can design one yourself.

[the carshop]

i got a 40 weber side draft already

 

 

[ggzilla]

What size venturis are in your 40? Only the largest size will extract the most power from a 2-liter. The smallest 40 venturis will flow less air than the stock carburetor.

[the carshop]

havnt opened it up yet but not i will. how bout on the turbo?? nuthn for an l20

[ggzilla]

You don't need to open it up, just read the venturi numbers, look down the carb throats.

 

To my knowledge, no one makes a turbo kit right now for a Datsun 620 or any other L20B vehicle. They did in the past. Guys can get 200 HP out of a little Datsun 1200cc stock-block with a stock 1400cc head, so the L20B should likewise pump out the power with careful part selection and tuning. Probably won't last 25,000 miles, but it is do-able.

[the carshop]

says tipo 40dcoe32 so 32 I'm guessing

[the carshop]

if i look down throat says 70 30'

[ggzilla]

30mm venturi is small, even with the stock L20B camshaft. The stock hitachi DCH340 has larger secondary venturi than that (31+24 on a plenum design which your sidedraft manifold lacks).

 

A Weber 40 can take up to to 36mm venturis. Which is still too small for high performance at 6000 RPM with a 2-liter engine.

 

Do you rev your engine to 5000 often? It's the best way to make more power -- rev it higher. With larger carburetor it should wake up without even changing the cam.

[banzai510(hainz)]

bolt a 38/38 weber outlaw and call it good.

L20 turbo? Never really seen one anymore locally most have cracked exhaust manifolds,and one that lasts beside Bertvorgens(Keith Law on the realm)

 

Ray Stonehocker might be the guy to ask

[the carshop]

i never really drive it hard its my daily and i only live about 3 miles from work, but once i do all the work i might spin em here n there but in all I TAKE CARE OF MY SHIT!!!! at least i try to.

[ggzilla]

Well then don't buy a larger camshaft. Because it only makes more power if you DRIVE IT HARD.

[the carshop]

heres the thing when i step on it..... i don't wanna feel like I'm in a prius lol wanna keep as a daily with some balls. its down to this either i build off this motor which runs super good or i go to an sr20. i know theres no comparing the two but...... i think u c where I'm coming from. i know the sr20det. alotta work, but in my opinion well worth it.

[ggzilla]

If you fit a larger cam, it won't make more power when you put your foot down unless you rev it higher than you do now.

 

It sounds like a KA24 would be best for you. 50% more HP and you don't have to rev it up high like an SR20.

[Amerikilla]

I sold a Ray-Jay turbo kit for an L-Series on eBay for $850 when I was a junior in highschool. LOL I should have kept it.

[the carshop]

hell ya u should have!!!!!!

[the carshop]

would have given u like 15 lol

[culowdragger72]

On Ebay some one selling a L-series Exhasut manifold flange, that's a start make your own turbo headers

[Amerikilla]

would have given u like 15 lol

HATER. LOL

[datzenmike]

Find an early 620 automatic or an '80 720 4x4 Long Bed. They both had a 4.625 ratio differentials. Cheap and easy to swap and you can swap it back to your 4.375 later. No mods to the motor needed so it runs the same. The lower gears remove top speed but give it back in improved low speed torque and acceleration. The motor is revving higher than the old gears at the same speed so it's making more power at that speed and revs quicker through the gears.

 

Truck flywheels are 29 pounds weight. Get a Maxima, 280z or zx flywheel they are 21 pounds. Both are 225mm so your clutch will fit and work on it.

[S.BURK]

So, I see a lot of conversations about the SR20 turbo motor but not much of the Ka24det motor. I have a 79 620 I want to put the Ka turbo motor in, is the preference in here the SR20's? and if so why is that? verses the Ka24?