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06-22-19, 04:54 PM
Replies: 100
Views: 3,901
Posted By Jeff20B

Yeah, for a first time you did pretty well. :) ...

Yeah, for a first time you did pretty well. :)

Now do the Judge Ito side seal protecting next step. I like to take a small round file and break up the hard sharp edge you have created along the...
06-22-19, 02:16 PM
Replies: 100
Views: 3,901
Posted By Jeff20B

when I say raise the roof, it is more of a...

when I say raise the roof, it is more of a cliche, but what it means is to cut more material from the ramp part, or in other words, to raise the roof of the port a little more to make it a more...
06-22-19, 01:12 PM
Replies: 100
Views: 3,901
Posted By Jeff20B

You might want to raise the roof a little bit. If...

You might want to raise the roof a little bit. If you study a true 74 spec port, it is pretty high up there. Also I think T2 and FD secondaries are that way. Yours have a ramp shape. But be careful...
06-21-19, 02:10 PM
Replies: 100
Views: 3,901
Posted By Jeff20B

The pineapple intake ports did cut into the oil...

The pineapple intake ports did cut into the oil seal track slightly which is part of the finesse I was talking about in that i did not cut into my oil seal track at all. Theirs was a racing engine...
06-21-19, 12:23 PM
Replies: 100
Views: 3,901
Posted By Jeff20B

That looks like about 2.5mm later closing than...

That looks like about 2.5mm later closing than true 74 spec. Is that right? My current 12A has that size on its primaries. It loses low end below say 2000 or so. It can still idle but a slight bit...
06-20-19, 01:50 PM
Replies: 100
Views: 3,901
Posted By Jeff20B

Ah, I see. Thanks.

Ah, I see. Thanks.
06-20-19, 12:27 AM
Replies: 100
Views: 3,901
Posted By Jeff20B

Yes as I recall not all carbs have the same timed...

Yes as I recall not all carbs have the same timed ports that connect to the left side of the spacer. That is another reason why I don't want to bother using it. I'll give the nipples a try in the...
06-19-19, 06:56 PM
Replies: 100
Views: 3,901
Posted By Jeff20B

I'm glad you posted it, if just for the RWHP...

I'm glad you posted it, if just for the RWHP figures as I don't know what they could do. It would be interesting to compare one of my carbs to Yaw's and just see what they could do in a head to head...
06-19-19, 09:49 AM
Replies: 100
Views: 3,901
Posted By Jeff20B

Ah but the thing about Yaw's version of a hogged...

Ah but the thing about Yaw's version of a hogged out Nikki at 24mm was his bellmouth shape which he claimed was... well let's just say he preferred it. One can only guess as to why.

What we...
06-18-19, 10:21 PM
Replies: 40
Views: 6,778
Posted By Jeff20B

Ah yes, Blake mentioned dry-break fittings and...

Ah yes, Blake mentioned dry-break fittings and that he welded some or most of this, which improved his welding skills during the process. I met him in real life and showed him some of my cool...
06-18-19, 10:13 PM
Replies: 100
Views: 3,901
Posted By Jeff20B

Who wants to field his questions about how much...

Who wants to field his questions about how much HP a 74 ported 12A with a hogged out Nikki (24mm primary and let's say 29mm or 30mm secondary) could make NA. I'll try. Um, count on like 150HP maybe....
06-17-19, 11:25 PM
Replies: 6
Views: 442
Posted By Jeff20B

Did you change the oil after your flooding...

Did you change the oil after your flooding episode?
06-16-19, 02:27 PM
Replies: 12
Views: 533
Posted By Jeff20B

and... I don't even know what type of carb you...

and... I don't even know what type of carb you are running because I can't remember when you mentioned it last.

But yes, temps can play a role on AFR. My thought is to jet it leaner on the main...
06-12-19, 11:44 PM
Replies: 17
Views: 650
Posted By Jeff20B

But the lingering question is: will you change...

But the lingering question is: will you change it? We are all aching to know.
06-11-19, 11:20 PM
Replies: 100
Views: 3,901
Posted By Jeff20B

We all call the edge closest to the coolant...

We all call the edge closest to the coolant jacket seal the "opening edge".

A way to simplify the idea about reversion pulse timing is to imagine a stock 12A with pri and sec ports the exact same...
06-11-19, 02:59 PM
Replies: 100
Views: 3,901
Posted By Jeff20B

Channels: both will have some flow, yes, but air...

Channels: both will have some flow, yes, but air also has velocity and inertia. It won't magically flow from a primary barrel over into a secondary runner. All the channels do is help with vacuum...
06-09-19, 05:37 PM
Replies: 18
Views: 830
Posted By Jeff20B

Don't remove H3 or H4

Don't remove H3 or H4
06-09-19, 02:15 PM
Replies: 100
Views: 3,901
Posted By Jeff20B

What j-tso shows and says is very accurate about...

What j-tso shows and says is very accurate about intake and exhaust ports.

I should mention my expereince with exhaust ports. The stock 12A opens at the same time as T2 but closes way early. I've...
06-09-19, 02:05 PM
Replies: 100
Views: 3,901
Posted By Jeff20B

The 76 Cosmo had the first of the 13Bs with the...

The 76 Cosmo had the first of the 13Bs with the smaller 40 degree closing ports, and the tall runner intermediate plate to use a reverse runner manifold. These made as much power and a couple numbers...
06-08-19, 11:06 PM
Replies: 100
Views: 3,901
Posted By Jeff20B

More insight? Um... Mine can have a brappy idle...

More insight? Um... Mine can have a brappy idle or a smooth idle. It depends on the carb and the tune. I kinda prefer a smooth idle. Does that help at all?
06-06-19, 03:20 PM
Replies: 100
Views: 3,901
Posted By Jeff20B

Perfect example of how so called "street ports"...

Perfect example of how so called "street ports" really are not good on the street, but can be driven there if necessary (just not enjoyably so). I'd request that we stop calling streetable racing...
06-05-19, 01:32 PM
Replies: 100
Views: 3,901
Posted By Jeff20B

KansasCityREPU, the rotor housings are 79 so they...

KansasCityREPU, the rotor housings are 79 so they don't communicate through the ACV port at all. But I still filled it with quicksteel.

Benjamin4456, the mani runners were very hogged out.

It...
06-04-19, 11:56 PM
Replies: 100
Views: 3,901
Posted By Jeff20B

Well Ok, I'll up the ante and tell you my current...

Well Ok, I'll up the ante and tell you my current 12A has pineapple porting on the end plates and slightly smaller ports on the primaries which are still bigger than 74 spec. The exhaust ports are...
06-04-19, 01:51 PM
Replies: 100
Views: 3,901
Posted By Jeff20B

I prefer 74 spec size ports. They are a better...

I prefer 74 spec size ports. They are a better port for the street than RB's streetable ports which were more meant for racing. Pineapple is the same way as RB in that it is a racing port that is...
05-31-19, 11:30 AM
Replies: 3
Views: 728
Posted By Jeff20B

It might be an HKS log style manifold.

It might be an HKS log style manifold.
Showing results 1 to 25 of 491
 


 
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