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#11

The Lounge / Re: Soliciting thoughts & opin...

Last post by 94touring - September 09, 2026, 07:59:44 AM

More info with that in mind and I realize building a motor in your apartment is out of your scope.  Taking that 8:5 ratio add the stroker crank and you get 9:3 compression. A size up on the pistons gives 9:4.  A worked 1110cc motor will make more power than a clapped out stock 1275 from a v tec swap. Change the drop gears to get a 3:1.

#12

The Lounge / Re: Soliciting thoughts & opin...

Last post by MPlayle - September 09, 2026, 06:54:01 AM

That is about what I expected the CR to be.  The engine is a 99HG31 series which online searches did not explicitly indicate the CR for.  The searches I did indicated standard 998s had 8.5 and the high-compression was 9.4.  I expected this one to be more towards the standard 8.5 which Dan's calculations confirm.

#13

The Lounge / Re: Soliciting thoughts & opin...

Last post by 94touring - September 08, 2026, 07:14:43 PM

I went out and did a compression test today for a current reference:
#1 - 152 psi
#2 - 152 psi
#3 - 145 psi
#4 - 152 psi

The plugs were all even in color - a light brown/tan on a set of NGK BP6ES plugs.

Using my engine build app, and what A+998 specs I quickly found online, so correct any numbers if I got bad info, gives you about 8:5:1 compression around 155psi cranking

#14

The Lounge / Re: Soliciting thoughts & opin...

Last post by MPlayle - September 08, 2026, 10:08:29 AM

I went out and did a compression test today for a current reference:
#1 - 152 psi
#2 - 152 psi
#3 - 145 psi
#4 - 152 psi

The plugs were all even in color - a light brown/tan on a set of NGK BP6ES plugs.

#15

The Lounge / Re: A new game... Post pics fr...

Last post by Jims5543 - September 08, 2026, 08:33:39 AM

I saw online where people were putting copper in their skimmers of their pools and it was cleaning up the water in the pool.

I decided to give it a try and I am amazed.  I am no longer using any algaecide in my pool. I was having a problem with some algae growing in my pool, I was applying algaecide every weekend and was still having a persistent problem with it.

Once I dropped these in the skimmer, the algae disappeared. I bought copper level test strips to work out how much copper I needed in the basket. I started with about 2X what is in the pic and my copper level was too high. These few is all I need. My pool water is crystal clear too, clearest I have ever seen it.  I mentioned this to the clerk at my corner pool store, he sheepishly admitted all algaecide is is copper in liquid form. 

If you have a pool, this is worth a try.

#16

Daves Garage / Re: Jeff Shaw Gearbox build

Last post by MiniDave - September 08, 2026, 08:03:42 AM

Cross pin all built up, bearings installed and back in the case, shimmed up properly.

In order to tighten the nuts on the ends of the mainshaft, I bolt a piece of angle across the top of the case and clamp it down in the vise, that holds it still and against the torque I need to tighten those nuts properly - (150 lbft!) Then I tap over all the locktabs and she's done on the inside.

Next it's just bolting on the end covers and checking the shim clearance on the intermediate gear. I should easily have it ready to ship out by the time he gets here later this month, then it's up to him to reassemble it to the motor and get her installed and running.

#17

The Lounge / Re: Soliciting thoughts & opin...

Last post by MPlayle - September 07, 2026, 04:25:03 PM

Thanks for the link.  I will read it through a bit later for educational reasons.

As for this engine project, I think attempting to convert my 998 to a 1098 is beyond the intended scope.

I called Dave C. (MiniDave) and had a good discussion with him about the endeavor and have a better understanding of some of the approaches under discussion.  I need some absorption time, but I think I may have a target approach in mind now.

Thanks to all that have contributed so far.  The discussion does remain open to contributions.

#18

The Lounge / Re: Soliciting thoughts & opin...

Last post by 94touring - September 07, 2026, 02:37:26 PM

It's been forever since I read this but should explain it.

https://www.calverst.com/technical-info/engine-1098-initial-tuning-potential/

#19

The Lounge / Re: Soliciting thoughts & opin...

Last post by MiniDave - September 07, 2026, 02:27:10 PM

No matter what you do with the gearing you're still only going to make about 40-45 hp with a 998, it's not enough to pull hills in 4th. A 1275 will make more torque and with a 3.0 will be in the sweet spot at highway speeds.

Dan's version with the 1098 crank will give it good torque, but you're talking about a total rebuild.

If you can find a guy with a Vtec removed 1275 you'd be in good shape.

Either that or go turbo - that will give you the torque to pull hills and the taller gears.

#20

The Lounge / Re: Soliciting thoughts & opin...

Last post by 94touring - September 07, 2026, 01:12:43 PM

You'd mock it up and see where the pistons top out at. Same as what I'm doing on a vw type 1 motor build with stroker crank, C height pistons, and 5.7" rods. You need to re-ring and dingle ball hone at minimum.  If there is a lip/ledge on the cylinder wall then you're looking at a bore up at that point. But this is all part of the process.