Talk of B20's, Gas and Power levels

egads (she/her) · 2017-03-30T08:39:31+00:00

No, LPG is not worth it if you have to pay for the initial conversion. Not sure if you are trying to bait me or not but "low output"? What do you mean by th...

deleted_user_160

There is a b20 race 142 here in Vic. It's at 130whp, running ms1 on itb's.
Seems low? Probably is, although most race car or cars that are driven regularly at the upper percentage of it's rpm. Aren't running as much power. Mostly for reliability?

Philia_Bear

blondejay;103880 wroteThere is a b20 race 142 here in Vic. It's at 130whp, running ms1 on itb's.
Seems low? Probably is, although most race car or cars that are driven regularly at the upper percentage of it's rpm. Aren't running as much power. Mostly for reliability?

running a lower rev limit is sure to lengthen the engine life
is he running on 91 or 98 or race fuel?

lots of reasons to detune motors after seeing what the max you can get out of them is

deleted_user_160

E85. High compression. And spends most of it's life up at 7000rpm was my understanding.
I would have thought more over all power. But yeah.
I don't know much more a out it.
@vee_que do you know more about Scott's 142?

Rick122S

Ive just been reading that's aprox what a stock Honda b20b dynos - 130whp. You would have to say the 16v head would be worth more than a few hp. Also a less power-sapping driveline.
I wouldn't be too upset if an 2L NA pushrod 8v motor designed in the 50's could put out the same as a comparative modern 16v does.

deleted_user_160

Probably not. It Would be fun no doubt.

Spac

If anyone can get 130hp ATW from a B20 on 91 octane fuel deserves the title
"Genius".

Philia_Bear

Spac;103907 wroteIf anyone can get 130hp ATW from a B20 on 91 octane fuel deserves the title
"Genius".

N/A or is FA allowed?

Spac

NA, seeing as that's what we're talking about.

deleted_user_160

I'll see what other info we can dig up from Scott

Philia_Bear

Spac;103910 wroteNA, seeing as that's what we're talking about.

I assume it also needs to last more than 15 seconds and cost less than $20k

deleted_user_160

This recent b20 has been running for a while, although it's still under the claimed power of your b20's mentioned earlier.
What was the differences there and the repco powered 120 locally here in Vic?

robv

Legal group n engines (2.0litre)I built in the late eighties had 120-130 rwhp on Thornleigh Performance centres Dino, showed about 10hp more at Town and Countries Dino in Hornsby

Vee_Que

Repco heads were using stock small valves, but the ports are raised, they are aimed as being a road head, not an all out racing cylinder head. Not to mention it's a heron head and needs custom pistons with a combustion chamber in them, like a diesel does. And they run even exhaust and intake so need custom ground cams all the time to tune.

Scott's car beats the class above them with the b20 and high ratio roller rockers, otherwise it is a ported head b20e, it's all in the cam, he doesn't run ethical, he ran avgas last I checked too.

The fact is, Dynos are only measures of power, a drag strip will show the ability to get the power down, Andy whites car ran a 14.4 at Geelong revival a few years back, making the 160whp claim possible, on a drag racing to hp calculator for the weight it's about right. Same with my wagon, for its weight a 14.4 with 3.54 diff is about right. So mike can go on all day about supposed drive train loss of only 10%, I notice now he's also seen engine Dynos, but the reality doesn't line up with what you see.

deleted_user_160

Chatting with Scott a Philip island coupe weeks ago. E85 confirmed and 12 odd static comp.

Vee_Que

He used to run avgas. Can run the same comp with either.

robv

Repco was a cross flow head, standard pistons and bottom end, different cam because of the port configuration, I rebuilt one for Max Stahle.dont remember it having different pistons?

Philia_Bear

Vee_Que;103930 wroteRepco heads were using stock small valves, but the ports are raised, they are aimed as being a road head, not an all out racing cylinder head. Not to mention it's a heron head and needs custom pistons with a combustion chamber in them, like a diesel does. And they run even exhaust and intake so need custom ground cams all the time to tune.

Scott's car beats the class above them with the b20 and high ratio roller rockers, otherwise it is a ported head b20e, it's all in the cam, he doesn't run ethical, he ran avgas last I checked too.

The fact is, Dynos are only measures of power, a drag strip will show the ability to get the power down, Andy whites car ran a 14.4 at Geelong revival a few years back, making the 160whp claim possible, on a drag racing to hp calculator for the weight it's about right. Same with my wagon, for its weight a 14.4 with 3.54 diff is about right. So mike can go on all day about supposed drive train loss of only 10%, I notice now he's also seen engine Dynos, but the reality doesn't line up with what you see.

Hrm...

Tentacle wagon (untuned B6304w/emissions cams) dyno'd 168whp (Shit tons of posts on this at the time on t-bricks)
4 different people took it for runs at PDX international raceway for a total of 15 runs (Shit tons of posts on this as it was with 4 other t-brick members)
fastest was 15.2 slowest was 15.4 average was 15.3

1/4 calculator says....
187.63hp with a known and reasonable weight of 3400lb (Car has been weighed a few times now)

The difference is 10%
Question is... what is a 1/4 calculator giving me?

Further note: Dyno results done in 3rd gear with TQ locked, 3rd on a AW30-40 is 1:1 near direct drive

Other random one... are we talking about Gross HP or SAE NET HP? (they are different)

Vee_Que

Always talking sae. Who runs things without accessories?

Rob, this is what the owner of two repco heads is telling me, he has the original set of pistons used in the 142r as well.

Rick122S

Is that 3400lb with driver and fuel? Putting 3600lb and 15.2 gets 200hp
That's 20%

Philia_Bear

Rick122S;103952 wroteIs that 3400lb with driver and fuel? Putting 3600lb and 15.2 gets 200hp
That's 20%

3400lb is with me and 1/8th tank of fuel
Also with part of the interior removed

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