 1.7l big bore kit? 1972? |
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| jdlmodelt |
 Dec 26 2012, 06:42 PM
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James D. Lane  Group: Members Posts: 345 Joined: 30-November 12 From: Colorado Member No.: 15,210 Region Association: Southwest Region  |
what is the biggest bore I can take my 1.7l to without major remods to the crankcase? recommendations?
thanks, j |
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| jdlmodelt |
Dec 27 2012, 11:43 PM
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James D. Lane Group: Members Posts: 345 Joined: 30-November 12 From: Colorado Member No.: 15,210 Region Association: Southwest Region |
OK. So what can I do to the stock 1.7l to improve HP without all the bore upgrades? Can I put in the same displacement but slightly bump up the compression? I'm putting a 2.0l out of my 76 for now but I'm planning ahead when the 2.0l in the 76 and the 1.7l back in the 72
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| brant |
Dec 27 2012, 11:59 PM
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914 Wizard Group: Members Posts: 11,639 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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QUOTE(jdlmodelt @ Dec 27 2012, 10:43 PM)  OK. So what can I do to the stock 1.7l to improve HP without all the bore upgrades? Can I put in the same displacement but slightly bump up the compression? I'm putting a 2.0l out of my 76 for now but I'm planning ahead when the 2.0l in the 76 and the 1.7l back in the 72 nice to see a colorado guy on here... the problem with the 1.7 is that is costs just as much to rebuild it with 70hp (correctly) as it does to rebuild a 2.0 motor with 105hp. your best economical bet would be SSI exhausts if you really want to open the engine, then a cam and carbs but at that point, its only 200$ more to put in the 2ltr crank and rods... your 1.7 heads and valves are really the limiting factor and rebuilding those with bigger heads are about the same price as rebuilding a set of 2.0 heads with bigger valves.... so stock 2.0 heads are cheaper than big valves on your cores. for the money.. finding a running $1000 2.0 motor gives you 90 - 95 hp and costs about 1/5th the cost of rebuilding... if you do open it up to rebuild, most people decide its worth adding the displaceemnt hp at that point for relatively the same costs... living with a running 1.7 gives up 15-20hp but costs $5-6K less....... |
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Posts in this topic
jdlmodelt 1.7l big bore kit? 1972? Dec 26 2012, 06:42 PM
Cap'n Krusty I'm thinking 96mm slip-ins. Gonna make a ton ... Dec 26 2012, 07:41 PM euro911 How about 94mm slip-ins, John? ... 1911cc? Dec 26 2012, 09:43 PM
ThePaintedMan
How about 94mm slip-ins, John? ... 1911cc?
Do t... Dec 27 2012, 12:22 AM euro911 My goof. 94mm would be 1832cc with the stock 66mm ... Dec 27 2012, 01:52 AM ThePaintedMan
My goof. 94mm would be 1832cc with the stock 66mm... Dec 27 2012, 08:54 AM Cap'n Krusty If you use 94 mm pistons, you CANNOT use the OE sp... Dec 27 2012, 10:54 AM Al Meredith I have a set of NPR (Nippon Piston Ring) 96MM pist... Dec 27 2012, 11:44 AM Cupomeat If it were me, I'd bite the bullet and go for ... Dec 27 2012, 11:54 AM jdlmodelt
OK. So what can I do to the stock 1.7l to improv... Dec 28 2012, 08:31 AM brant we have a local colorado yahoo group too
you ought... Dec 28 2012, 08:52 AM sean_v8_914 have had success with the 1911 at no more than 8.5... Dec 28 2012, 09:10 AM thelogo [quote name='sean_v8_914' date='Dec 28... Dec 28 2012, 10:06 PM Dave_Darling There have been 96mm P&C sets made for the 1.7... Dec 29 2012, 12:55 AM |
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