Classic Motorsports Sept Issue

[MCS]

Article on building 100 hp 1275 eng, the shop used was David Antons APT
Cheers
Phil

 

[Hap Waldrop]

I have not read this article yet, I talked to David alot during the build, I believe thet is the one built for Carl for the modern Midget.

 

[BuggerAll]

I saw the car up at Carlisle. I think it would have been nice of them to run the car on the chassis dyno there and post the sheet so we could see a real-world result. I hope they post more tech info in the next issue, as I'm about to commence my 1360 build and have not yet firmed up things like cam choice. Full carb specs would be nice too, along with measured AFRs for the dyno pulls and ignition advance numbers.

 

[vagt6]

With 100+ HP, I wonder if the car would even run below 3500-4000 RPM.

I wouldn't want to sit around in traffic with it . . .

 

[Westfield_XI]

My 100HP 1380 was built by APT and was the one just before the Classic Motorsports motor. While I have not put it on the road yet, it idled just fine on the dyno and made lots of torque below 3k rpm. IMHO and in others who know better than I, a large capacity A-series is a very good street motor and at that power level is fairly understressed, after all it was run on 87 octane. Now if you were making that power out of a 948, I would have to agree.

I will have to dig up my dyno sheets and see if my scanner still works.

 

[Hap Waldrop]

With 100+ HP, I wonder if the car would even run below 3500-4000 RPM.

I wouldn't want to sit around in traffic with it . . .

Yeah, if I'm not mistaken, David used the VP276 cam, thats a cam I use alot, it's in both Ray and Drew's motor. That cam might take a little more idel say 1100-1200 but iot will idle fine at redlights and stop signs. You can get get 90-95 for a .040" over engine, theonly difference in thios motor is the bore size, the 100ish od CCs will net say 5-10 HP. 1380 are fine as long as the owner knows what they are getting into, there could be block issues, rare, but you still have to realize the possiblity and they, 1380s, tend to run a tick warmer than smaller bores, nad you have to run a sopeciual head gasket, which isn't available in the better composite material. Compression ratio is anmother considerration, knowing david as well i do, you can bet this motor is probably around 10 to 1, that that where I build most of mine too, the CR is the #1 HP maker in these engine, kroe than anything else.